Question: 1. (I) What force is needed to accelerate a sled (mass = 55 kg) at 1.4 m/s on horizontal frictionless ice? 3. (1) How

1. (I) What force is needed to accelerate a sled (mass = 55 kg) at 1.4 m/s on horizontal frictionless ice? 3. (1) How much tension must a rope withstand if it is used to accelerate a 1210-kg car horizontally along a frictionless surface at 1.20 m/s? 5. (II) Superman must stop a 120-km/h train in 150 m to keep it from hitting a stalled car on the tracks. If the train's mass is 3.6 105 kg, how much force must he exert? Compare to the weight of the train (give as %). How much force does the train exert on Superman? 7. (II) What average force is required to stop a 950-kg car in 8.0 s if the car is traveling at 95 km/h? 9. (II) A 0.140-kg baseball traveling 35.0 m/s strikes the catcher's mitt, which, in bringing the ball to rest, recoils backward 11.0 cm. What was the average force applied by the ball on the glove? 11. (II) A 20.0-kg box rests on a table. (a) What is the weight of the box and the normal force acting on it? (b) A 10.0-kg box is placed on top of the 20.0-kg box, as shown in Fig. 4-43. Determine the normal force that the table exerts on the 20.0-kg box and the normal force that the 20.0-kg box exerts on the 10.0-kg box. 13. (II) A 75-kg petty thief wants to escape from a third-story jail window. Unfortunately, a makeshift rope made of sheets tied together can support a mass of only 58 kg. How might the thief use this "rope to escape? Give a quantitative answer. 15. (II) Can cars "stop on a dime"? Calculate the acceleration of a 1400-kg car if it can stop from 35 km/h on a dime (diameter = 1.7 cm). How many g's is this? What is the force felt by the 68-kg occupant of the car? 17. (II) (a) What is the acceleration of two falling sky divers (total mass = 132 kg including parachute) when the upward force of air resistance is equal to one-fourth of their weight? (b) After opening the parachute, the divers descend leisurely to the ground at constant speed. What now is the force of air resistance on the sky divers and their parachute? See Fig. 4-44. 10.0 kg 20.0 kg FIGURE 4-43 Problem 11. FIGURE 4-44 Problem 17.

Step by Step Solution

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock

To find the force needed to accelerate the sled we can use Newtons second law of motion F m a Given the mass m 55 kg and acceleration a 14 ms we can c... View full answer

Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock

Step: 3 Unlock

Document Format (2 attachments)

6642401addaf9_984046.pdf

180 KBs PDF File

6642401addaf9_984046.docx

120 KBs Word File

Students Have Also Explored These Related Physics Questions!

Ch 6 - Workshop uses How We Increased Productivity on the Shop Floor By PAUL DOWNS article Evaluate the solutions that were implemented.

What force is needed to accelerate a child on a sled (total mass = 60.0kg) at 1.25m/s2?

What average force is needed to accelerate a 7.00-gram pellet from rest to 125m/s over a distance of 0.800m along the barrel of a rifle?

The membrane filter technique is used to test a polluted water sample for coliform group. Three different dilutions of the water sample were prepared and each was filtered through 5 filter membranes....

Why is a hierarchical database model considered to be a navigational database? What are some limitations of the hierarchical database model?

All decisions are ethical decisions. Comment on this statement, particularly by referring to the concepts of moral intensity and ethical sensitivity.

49. A and B play a series of games with A winning each game with probability p. The overall winner is the first player to have won two more games than the other. (a) Find the probability that A is...

Arcus Development Inc.s equity section on the December 31, 2013, balance sheet showed the following information: Common shares, unlimited shares authorized, 150,000 shares issued and...

Why do you think the Chinese Government tried to limit the depreciation by using dollars to buy yuan? Why did it not stop the fall in the yuan?

An investor buys a T-bill at a bank discount quote of 4.40 with 90 days to maturity. The investor's actual annual rate of return on this investment is 4.39%4.45%4.51%4.68%

Write one short paragraphs about the target market segments for your client and why you think this company and product will be successful. Are there economic, social, or other trends that make this a...

Quiz Instructions: Term Structure Models II and Introduction to Credit Derivatives Questions 1 and 2 should be answered by building and calibrating a 10-period Black-Derman-Toy model for the...

a1 a2 a3 15. (23) Let A = b b2 b3 and B = = C1 4a1b1 4a2+ b2 4a3+b3 C2 C3 C1 C2 C3 3b1 3b2 3b3 If det(B) = 6, then (1) det(A) = and (4) rank(A-1) = (2) det(2ABA-) = (3) det(BBT) =

For Exercises 27-32, refer to functions s, t, and v. Find the indicated function and write the domain in interval notation. (See Example 3) s(x) 27. (s. 1)(x) 31. (sv)(x) = x-2 x-9 x-3 t(x) = bail...

Demonstrate how the host from computer A identifying the destination of computer G before A can start sending file to the computer. == SWITCH ROUTER SWITCH A B C G H

In the month of September, Thiel Company sold 900 units of a product. The sales price was $30 per unit. During the month, fixed costs were $7,200 and variable costs were 70% of sales. Prepare a...

A parking lot charges $3 for the first hour (or part of an hour) and $2 for each succeeding hour (or part), up to a daily maximum of $10. (a) Sketch a graph of the cost of parking at this lot as a...

Genetic Disorder Four males with an X-linked genetic disorder have one child each. The random variable x is the number of children among the four who inherit the X-linked genetic disorder. XO 0 P(x)...

Male Color Blindness When conducting research on color blindness in males, a researcher forms random groups with five males in each group. The random variable x is the number of males in the group...

Which technology and method would you use to perform the migrations in the branch offi ce? LO.1