All Matches

Solution Library

Expert Answer

Textbooks

Search Textbook questions, tutors and Books

Oops, something went wrong!

Change your search query and then try again

Result Not Found

Books FREE
Tutors
Study Help
Ask a Question

Search
Sign In
Register

study help
sciences
college physics reasoning

Questions and Answers of College Physics Reasoning

Consider a reaction that involves the creation of two elementary particles as in Figure P7.56. One particle is a proton of mass mp, and the other has mass m2= mp/1800. If the proton leaves the
Finding the barycenter. How far is the center of mass of the Earth-Moon system from the center of the Earth? Is it below the surface of the Earth?
A father (mF = 75 kg) and his daughter (mD = 35 kg) stand on a flat, frozen lake of negligible friction. They hold a 10-m-long rope stretched between them. The father and daughter then pull the rope
Twin brothers, each of mass 50 kg, sit in a symmetric canoe of mass 40 kg. Each boy sits 1.5 m away from the center of the canoe as they toss a basketball (mass = 0.60 kg) back and forth.(a) How much
A block of mass 3.5 kg is initially at rest on a wedge of mass 20 kg, height 0.30 m, and incline angle θ = 35° as shown in Figure P7.60. There is no friction between the wedge and the floor.
Consider three scenarios for a one-dimensional elastic collision in which a “bullet” is fired at a stationary target. For each scenario, determine the final velocities of both the bullet, v1f,
Fun with a Super Ball. A Super Ball has a coefficient of restitution α = 0.90. This means that the y components of the ball???s velocity just before and after hitting the floor are related by vfy=
Consider again the discussion in Section 7.2 concerning air bags and impulse for a car colliding with a tree. The car’s velocity of 40 mi/h is reduced to zero very quickly, but the head of a
Crumple zones. A life-saving development in automobile manufacture is the invention of crumple zones, areas of the body and frame of a car deliberately made to collapse in a collision (Fig. P7.64)
A projectile of mass 10 kg is launched at an angle of 55° and an initial speed of 87 m/s. Just as the object reaches the maximum height in its trajectory, a small explosion along the horizontal
A cart of mass m1= 10 kg slides down a friction less ramp and is made to collide with a second cart of mass m2= 20 kg, which then heads into a vertical loop of radius 0.25 m as shown in Figure
Again consider the track and carts in Figure P7.66 with m1= 10 kg and m2= 20 kg, but this time the carts stick together after the collision.? (a) Find the height h from which cart 1 would need to
A firefighter directs a horizontal stream of water toward a fire at an angle of 40° measured from the horizontal. The fire hydrant and hose deliver 95 gallons per minute (1 gal/min = 6.31 × 10-4
A machine gun directs a flow of bullets at a steel target mounted on a cart with negligible friction and of mass 600 kg. In this case, the gun is an Uzi, which uses 9-mm (8.0-g) bullets and can fire
Rocket engines work by expelling gas at a high speed as illustrated in Figure P7.71. We wish to design an engine that expels an amount of gas mg= 50 kg each second, and we want the engine to exert a
Comet Shoemaker-Levy struck Jupiter in 1994. Just before the collision, the comet broke into several pieces. The total mass of all the pieces was estimated to be 3.8 × 108 kg, and they all had a
Figure P7.73 shows two stars with masses m1and m2moving in circular orbits (the dashed circles) due to their mutual gravitational attraction. What is the approximate value of the mass ratio
A man (m1= 90 kg) is standing on a railroad flat car that is 9.0 m long and of unknown mass m2. The man and the car are initially at rest on a level track (Fig. P7.74A), and the wheels of the car are
What is the magnitude of the momentum of a baseball (m = 0.14 kg) traveling at a speed of 100 mi/h? Express your answer in SI units.
The boxes in Figure Q7.2 all have the same mass and size. What is the approximate location of the center of mass of the two boxes in case 1, the three boxes in case 2, and the four boxes in case
Consider two cars, one a compact model (m = 800 kg) and the other an SUV (m = 2500 kg). The SUV is traveling at 10 m/s, while the compact car is traveling at an unknown speed v. If the two cars have
What is the approximate location of the center of mass of the boomerang in Figure Q7.3? Figure Q7.3 ? y — х
Consider two cars that are on course for a head-on collision. If they have masses m1 = 1200 kg and m2 = 1800 kg and are both traveling at 30 m/s, what is the magnitude of the total momentum?
Explain why the center of mass of an object (such as the boomerang in Fig. Q7.3) may not be ???inside??? the object. We discussed how the center of mass can be thought of as the ???balance point???
Two particles of mass m1= 1.2 kg and m2= 2.9 kg are traveling as shown in Figure P7.4. What is the total momentum of this system? Be sure to give the magnitude and direction of the momentum. Figure
If the magnitude of the momentum of an object is increased by a factor of three, by what factor is the kinetic energy changed? Assume the mass of the object is unchanged.
Slap shot! A hockey player strikes a puck that is initially at rest. The force exerted by the stick on the puck is 1000 N, and the stick is in contact with the puck for 5.0 ms (0.0050 s). (a)
Two objects of different mass have the same kinetic energy. Which one has the larger momentum?
A constant force of magnitude 25 N acts on an object for 3.0 s. What is the magnitude of the impulse?
A baseball has a certain momentum pball and a certain kinetic energy KEball. One golf ball (ball 1) is given a momentum equal to pball, and a second golf ball (ball 2) is given a kinetic energy equal
A rubber ball (mass 0.25 kg) is dropped from a height of 1.5 m onto the floor. Just after bouncing from the floor, the ball has a speed of 4.0 m/s. (a) What are the magnitude and direction of
Consider the momentum of an object that is undergoing projectile motion. Is its momentum conserved? If the answer is no, is any component of the momentum conserved? Explain.
For the cue ball in Figure Q7.12, make a qualitative sketch of how the force exerted by the rail on the ball varies with time. Be sure to plot both the x and y components of the force and indicate
In which case is the momentum change of a baseball largest, (a) A pitch caught by a catcher, (b) A baseball thrown by a pitcher, or (c) A baseball hit by a batter? Explain your answer.
(a) What is the impulse imparted to the ball? Be sure to give the magnitude and direction. (b) What is the change in momentum of the ball? Be sure to give the magnitude and
Consider the collision between an asteroid and a rocket as discussed in connection with Figure 7.17. We have already calculated the deflection angle that results from the collision with the rocket
A rubber ball is dropped and bounces vertically from a horizontal concrete floor. If the ball has a speed of 3.0 m/s just before striking the floor and a speed of 2.5 m/s just after bouncing, what is
Finish the analysis of the force in the automobile collision in Example 7.7. Find the average collision force along y and the magnitude of the total collision force.
A baseball player hits a baseball (m = 0.14 kg) as shown in Figure P7.11. The ball is initially traveling horizontally with a speed of 40 m/s. The batter hits a fly ball as shown, with speed vf= 55
A cue ball bounces off the rail of a pool table as shown in Figure Q7.12. The momentum of the ball changes.? (a) What is the source of the impulse?? (b) That is, what is the source of the force?? (c)
The baseball in Problem 11 is replaced by a very flexible rubber ball of equal mass.? (a) Does the contact time increase or decrease?? (b) If the contact time changes by a factor of 50 but the
Two crates are on an icy, friction less, horizontal surface. One of the crates is then given a push and collides with the other. If the crates stick together after the collision, which of the
An egg and a tomato of equal mass are dropped from the roof of a three-story building onto the sidewalk below. The sidewalk imparts an impulse to both as they splatter. (a) Is the impulse
A tennis ball and a ball of soft clay are dropped from the same height onto the floor below. The force from the floor produces an impulse on each ball. If the balls have the same mass, which impulse
Consider an archer who fi res an arrow. The arrow has a mass of 0.030 kg and leaves the bow with a horizontal velocity of 80 m/s. (a) What is the impulse imparted to the arrow? Give both the
When you fire a gun, you experience a recoil force due to the impulse produced by the bullet on the barrel of the gun. Is it possible to design a gun in which the recoil force is zero? If so, explain
Consider a tennis player who hits a serve at 140 mi/h (63 m/s). Estimate the average force exerted by the racket on the ball (m = 57 g).You will need to estimate the collision time, that is, the time
Two masses m1 and m2 have the same momentum. If the masses are not equal, which statement(s) are correct? (a) The velocities are the same. (b) The velocities are in the same direction. (c) The
Consider the problem of returning a serve in tennis. A serve is hit at a speed of 63 m/s and is hit back to the server with a speed of 40 m/s. (a) What is the impulse imparted to the
In the event of a two-car, head-on collision, would you rather be riding in a heavy car (large mass) or a small car? Justify your answer in terms of the impulse and force on a car during a collision.
A golf ball is hit from the tee and travels a distance of 300 yards. Estimate the magnitude of the impulse imparted to the golf ball. Ignore air drag in your analysis.You will need to estimate the
Explain why a padded dashboard makes a car safer in the event of an accident.
Uppercut! A boxer hits an opponent on the chin and imparts an impulse of 500 N · s. Estimate the magnitude of the average force.You will need to estimate the collision time, that is, the time two
An astronaut is working in distant space (outside his spaceship and far from any planets or stars) and floating freely when he accidently throws a wrench. (a) Is the astronaut’s momentum
Suppose the force on an object varies with time as shown in Figure P7.19. Estimate the impulse imparted to the object. Assume the motion is one dimensional. Figure P7.19 ? F (N)_ 3000 2000 1000 -t
As an apple falls from a tree, its speed increases, so the magnitude of its momentum also increases. Explain why this is consistent with the principle of conservation of momentum.
Two objects of mass m and 3m undergo a completely inelastic collision in one dimension. If the two objects are at rest after the collision, what was the ratio of their speeds before the collision?
Two particles of mass m1= 1.5 kg and m2= 3.5 kg undergo a one-dimensional head-on collision as shown in Figure P7.21. Their initial velocities along x are v1i= 12 m/s and v2i= -7.5 m/s. The two
Two skaters are studying collisions on an ice-covered (frictionless) lake. Skater 1 (m1 = 85 kg) is initially traveling with a speed of 5.0 m/s, and skater 2 (m2 = 120 kg) is initially at rest.
The particles in Figure P7.21 (m1= 1.5 kg and m2= 3.5 kg) undergo an elastic collision in one dimension. Their velocities before the collision are v1i= 12 m/s and v2i= -7.5 m/s. Find the velocities
has an initial speed of 20 m/s, and puck 2 has an initial speed of 15 m/s. They collide, and some glue on one of the pucks causes them to stick together.? (a) If the two pucks form a ???system,??? is
In Example 7.5, we considered an elastic collision in one dimension in which one of the objects is initially at rest. Notice that mass 2 is the one that is initially at rest. Use the results for v1f
Two billiard balls undergo an elastic collision as shown in Figure P7.27. Ball 1 is initially traveling along x with a speed of 10 m/s, and ball 2 is at rest. After the collision, ball 1 moves away
Consider an elastic collision in one dimension that involves objects of mass 2.5 kg and 4.5 kg. The larger mass is initially at rest, and the smaller one has an initial velocity of 12 m/s. Find the
Two hockey players are traveling at velocities of v1 = 12 m/s and v2 = -18 m/s when they undergo a head-on collision. After the collision, they grab each other and slide away together with a velocity
Two cars of equal mass are traveling as shown in Figure P7.30 just before undergoing a collision. Before the collision, one of the cars has a speed of 18 m/s along +x and the other has a speed of 25
Two cars collide head-on and lock bumpers on an icy (frictionless) road. One car has a mass of 800 kg and an initial speed of 12 m/s and is moving toward the north. The other car has a mass of 1200
A baseball pitcher (m = 80 kg) is initially standing at rest on an extremely slippery, icy surface. He then throws a baseball (m = 0.14 kg) with a horizontal velocity of 50 m/s. What is the recoil
A military gun is mounted on a railroad car (m = 1500 kg) as shown in Figure P7.34. There is no frictional force on the car, the track is horizontal, and the car is initially at rest. The gun then
An open railroad car of mass 2500 kg is coasting with an initial speed of 14 m/s on a friction less, horizontal track. It is raining, and water begins to accumulate in the car. After some time, it is
The M79 grenade launcher was first used by the U.S. Army in 1961. It fires a grenade with an approximate mass m ≈ 7.0 kg at a speed of 75 m/s. (a) If a soldier fires the M79 horizontally while
A skateboarder (m = 85 kg) takes a running jump onto a friend???s skateboard that is initially at rest as sketched in Figure P7.37. The friend is standing on the skateboard (mass of friend plus
A bullet of mass 15 g is fired with an initial speed of 300 m/s into a wooden block that is initially at rest. The bullet becomes lodged in the block, and the bullet and block then slide together on
A railroad car containing explosive material is initially traveling south at a speed of 5.0 m/s on level ground. The total mass of the car plus explosives is 3.0 × 104 kg. An accidental spark
Find the center of mass of the two particles in Figure P7.41. Figure P7.41 ? 7.0 kg 3.0 kg т т х (m) -5 5
Find the center of mass of the four particles in Figure P7.42. Their masses are m1= 12 kg, m2?= 18 kg, m3= 7.9 kg, and m4= 23 kg. Figure P7.42 ? y (m). -10 -5. х (m) 10- -5. m2
Two objects are moving along the x axis with velocities of 35 m/s (object 1) and -25 m/s (object 2). (a) If the center of mass has a velocity of +10 m/s, which object has the greater
A rock of mass 3.3 kg is tied to a string of length 1.2 m. The rock is held at rest as shown in Figure P6.49 so that the string is initially tight, and then it is released.? (a) Find the speed of the
Consider again the skateboarder in Figure P6.39. (a) Assuming she starts at the top of the half-pipe, make qualitative sketches of her kinetic energy and potential energy as a function of x in the
A car of mass m = 1500 kg is pushed off a cliff of height h = 24 m (Fig. P6.28). If the car lands a distance of 10 m from the base of the cliff, what was the kinetic energy of the car the instant
A heavy crate is pushed across a level floor at a constant velocity. What is the total work done on the crate by all forces? How does your answer change if the crate is being pushed up a hill?
A compact disc spins at 2.5 revolutions per second. An ant is walking on the CD and finds that it just begins to slide off the CD when it reaches a point 3.0 cm from the CD’s center. (a) What
A rock is thrown horizontally with a speed of 20 m/s from a vertical cliff of height 25 m. (a) How long does it take the rock to reach the horizontal ground below? (b) How far will it land
A sphere of mass 35 kg is attached to one end of a rope as shown in Figure P6.1. It is found that the rope does an amount of work W = 550 J in pulling the sphere upward through a distance 1.5 m. Find
Consider an object undergoing uniform circular motion. We know from Chapter 5 that circular motion is caused by a force that is directed toward the center of the circle. What is the work done by this
For the sphere in Problem 1, find the work done by the force of gravity on the sphere.Data From Problem 1A sphere of mass 35 kg is attached to one end of a rope as shown in Figure P6.1. It is found
Explain why kinetic energy can never be negative, but the potential energy can be positive, negative, or zero.
A crate of mass 50 kg is pushed across a level floor by a person. If the person exerts a force of 25 N in the horizontal direction and moves the crate a distance of 10 m, what is the work done by the
A hockey puck of mass 0.25 kg is sliding along a slippery frozen lake, with an initial speed of 60 m/s. The coefficient of friction between the ice and the puck is μK = 0.030. Friction eventually
Consider a satellite in an elliptical orbit around the Earth. What is the sign (positive or negative) of the power associated with the gravitational force of the Earth on the satellite?
A crate of mass 24 kg is pushed up a friction less ramp by a person as shown in Figure P6.5. Calculate the work done by the person in pushing the crate a distance of 20 m as measured along the ramp.
Consider an apple that falls from a branch to the ground below. At what moment is the kinetic energy of the apple largest? At what moment is the gravitational potential energy largest?
For the bungee jumper in Example 6.9 (page 189), plot the following quantities as a function of time: (a) the gravitational potential energy of the jumper, (b) the kinetic energy of the jumper, (c)
Consider again the crate in Problem 5, but now include friction. Assume the coefficient of kinetic friction between the crate and the ramp is μK= 0.25. What is the work done by the person as he
The work done by friction is usually negative, as in the case of an object that slides to a stop. The work done by friction does not have to be negative, however. Give an example in which the work
Find the work done by gravity on the crate in Problem 6. Data From Problem 6 Consider again the crate in Problem 5, but now include friction. Assume the coefficient of kinetic friction between the
Motor 1 does 20 J of work in 10 s, while motor 2 does 5 J of work in 1 s. Which motor produces the greatest power?
A car (m = 1200 kg) is traveling at an initial speed of 15 m/s. It then slows to a stop over a distance of 80 m due to a force from the brakes. How much work is done on the car? Assume the
A block of mass m = 5.0 kg is pulled along a rough horizontal surface by a rope as sketched in Figure P6.8. The tension in the rope is 40 N, and the coefficient of kinetic friction between the block
According to Equation 6.29, power is related to force and velocity by P = Fv. Is it possible for P to be negative? Give an example and explain what it means for P to be negative.

Showing 3400 - 3500 of 4093

First
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41

Get In Touch

About Us
Contact Us
Career
Jobs
FAQ
Campus Ambassador

Company Info

Security
Copyrights
Privacy Policy
Terms & Condition
SolutionInn Fee
Scholarship

Services

Sitemap
Fun
Definitions
Become Tutor
Study Help Categories
Recent Questions
Expert Questions

Copyright © 2024 SolutionInn All Rights Reserved.

Get the SolutionInn - Study Help App