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physics
college physics a strategic approach 2nd

Questions and Answers of College Physics A Strategic Approach 2nd

A hockey puck slides along the surface of the ice. If friction and air resistance are negligible, what force is required to keep the puck moving?
An automobile has a head-on collision. A passenger in the car experiences a compression injury to the brain. Is this injury most likely to be in the front or rear portion of the brain? Explain.
If an object is not moving, does that mean that there are no forces acting on it? Explain.
In a head-on collision, an infant is much safer in a child safety seat when the seat is installed facing the rear of the car. Explain.
An object moves in a straight line at a constant speed. Is it true that there must be no forces of any kind acting on this object? Explain.
Three arrows are shot horizontally. They have left the bow and are traveling parallel to the ground as shown in Figure Q4.6. Air resistance is negligible. Rank in order, from largest to smallest, the
A ball sits near the front of a child's wagon. As she pulls on the wagon and it begins to move forward, the ball rolls toward the back of the wagon. Explain why the ball rolls in this direction.
A carpenter wishes to tighten the heavy head of his hammer onto its light handle. Which method shown in Figure Q4.7 will better tighten the head? Explain. FIGURE Q4.7
A circus clown hangs from one end of a large spring. The other end is anchored to the ceiling. Identify the forces on the clown.
Internal injuries in vehicular accidents may be due to what is called the "third collision." The first collision is the vehicle hitting the external object. The second collision is the person hitting
a. Give an example of the motion of an object in which the frictional force on the object is directed opposite to the motion. b. Give an example of the motion of an object in which the frictional
Suppose you are an astronaut in deep space, far from any source of gravity. You have two objects that look identical, but one has a large mass and the other a small mass. How can you tell the
Jonathan accelerates away from a stop sign. His eight-year-old daughter sits in the passenger seat. On whom does the back of the seat exert a greater force?
A skier is sliding down a 15° slope. Friction is not negligible. Identify the forces on the skier.
The weight of a box sitting on the floor points directly down. The normal force of the floor on the box points directly up. Need these two forces have the same magnitude? Explain.
A tennis ball is flying horizontally across the net. Air resistance is not negligible. Identify the forces on the ball.
A ball weighs 2.0 N when placed on a scale. It is then thrown straight up. What is its weight at the very top of its motion? Explain.
Josh and Taylor, standing face-to-face on frictionless ice, push off each other, causing each to slide backward. Josh is much bigger than Taylor. After the push, which of the two is moving faster?
A person sits on a sloped hillside. Is it ever possible to have the static friction force on this person point down the hill? Explain.
Walking without slipping requires a static friction force between your feet (or footwear) and the floor. As described in this chapter, the force on your foot as you push off the floor is forward
Figure P4.21 shows an object's acceleration-versus-force graph. What is the object's mass? a (m/s²) 4 لیا 2 1 0 FIGURE P4.21 0.0 0.5 1.0 - F (N)
A car has a maximum acceleration of 5.0 m/s2. What will the maximum acceleration be if the car is towing another car of the same mass?
A block has acceleration a when pulled by a string. If two identical blocks are glued together and pulled with twice the original force, their acceleration will be A. (1/4)a B. (1/2)a C. a D.
Two children fight over a 200 g stuffed bear. The 25 kg boy pulls to the right with a 15 N force and the 20 kg girl pulls to the left with a 17 N force. Ignore all other forces on the bear (such as
A 5.0 kg block has an acceleration of 0.20 m/s2 when a force is exerted on it. A second block has an acceleration of 0.10 m/s2 when subject to the same force. What is the mass of the second block?A.
A person gives a box a shove so that it slides up a ramp, then reverses its motion and slides down. The direction of the force of friction is A. Always down the ramp. B. Up the ramp and then down
A person is pushing horizontally on a box with a constant force, causing it to slide across the floor with a constant speed. If the person suddenly stops pushing on the box, the box will.A.
Rachel is pushing a box across the floor while Jon, at the same time, is hoping to stop the box by pushing in the opposite direction. There is friction between the box and floor. If the box is moving
Dave pushes his four-year-old son Thomas across the snow on a sled. As Dave pushes, Thomas speeds up. Which statement is true? A. The force of Dave on Thomas is larger than the force of Thomas on
Three ice skaters, numbered 1, 2, and 3, stand in a line, each with her hands on the shoulders of the skater in front. Skater 3, at the rear, pushes on skater 2. Identify all the action/reaction
Redraw the motion diagram shown in Figure P4.40, then draw a vector beside it to show the direction of the net force acting on the object. Explain your reasoning. FIGURE P4.40
A girl stands on a sofa. Identify all the action/reaction pairs of forces between the girl and the sofa.
A student draws the flawed free-body diagram shown in Figure P4.50 to represent the forces acting on a car traveling at constant speed on a level road. Identify the errors in the diagram, then draw a
A student draws the flawed free-body diagram shown in Figure P4.51 to represent the forces acting on a golf ball that is traveling upward and to the right a very short time after being hit off the
A beach ball is thrown straight up, and some time later it lands on the sand. Is the magnitude of the net force on the ball greatest when it is going up or when it is on the way down? Or is it the
When you are pulling on the rope as shown, what is the approximate direction of the tension force on the tree? A. North B. South C. East D. West
Assume that you are pulling on the rope but the car is not moving. What is the approximate direction of the force of the mud on the car? A. North B. South C. East D. West
Suppose your efforts work, and the car begins to move for- ward out of the mud. As it does so, the force of the car on the rope is.A. Zero. B. Less than the force of the rope on the car. C. Equal
An object is subject to two forces that do not point in opposite directions. Is it possible to choose their magnitudes so that the object is in equilibrium? Explain.
What forces are acting on you right now? What net force is acting on you right now?
A 1000 kg steel beam is supported by the two ropes shown in Figure P5.4. Each rope can support a maximum sustained tension of 5600 N. Do the ropes break? Rope 1- 30° 30° FIGURE P5.4 -Rope 2
A 20 kg loudspeaker is suspended 2.0 m below the ceiling by two cables that are each 30 from vertical. What is the tension in the cables?
A light block of mass m and a heavy block of mass M are attached to the ends of a rope. A student holds the heavier block and lets the lighter block hang below it, as shown in Figure Q5.6. Then she
When you bend your knee, the quadriceps muscle is stretched. This increases the tension in the quadriceps tendon attached to your knee cap (patella), which, which, in turn, increases the tension in
The two angled ropes used to support the crate in Figure P5.7 can withstand a maximum tension of 1500 N before they break. What is the largest mass the ropes can support? 30° FIGURE P5.7 45°
Three objects move through the air as shown in Figure Q5.11. Rank in order, from largest to smallest, the three drag forces D1, D2, and D3. Some may be equal. Give your answer in the form A > B =
A ball is thrown straight up. Taking the drag force of air into account, does it take longer for the ball to travel to the top of its motion or for it to fall back down again?
A skydiver is falling at her terminal speed. Right after she opens her parachute, which has a very large area, what is the direction of the net force on her?
Raindrops can fall at different speeds; some fall quite quickly, others quite slowly. Why might this be true?
An airplane moves through the air at a constant speed. The jet engine's thrust applies a force in the direction of motion. Reducing thrust will cause the plane to fly at a slower-but still constant
Is it possible for an object to travel in air faster than its terminal speed? If not, why not? If so, explain how this might happen.
For Questions determine the tension in the rope at the point indicated with a dot. • All objects are at rest. • The strings and pulleys are massless, and the pulleys are frictionless. 5
In a head-on collision, a car stops in 0.10 s from a speed of 14 m/s. The driver has a mass of 70 kg, and is, fortunately, tightly strapped into his seat. What force is applied to the driver by his
For Questions 16 through 19, determine the tension in the rope at the point indicated with a dot.• All objects are at rest. • The strings and pulleys are massless, and the pulleys are
An astronaut's weight on earth is 800 N. What is his weight on Mars, where g = 3.76 m/s2?
The floor is frictionless. In which direction is the kinetic friction force on block 1 in Figure Q5.20? On block 2? Explain. Pulley 1 2
A woman has a mass of 55.0 kg. a. What is her weight on earth? b. What are her mass and her weight on the moon, where g = 1.62 m/s2?
The wood block in Figure Q5.21 is at rest on a wood ramp. In which direction is the static friction force on block 1? .A. Up the slope. B. Down the slope. C. The friction force is zero.D. There's
A 2.0 kg ball is suspended by two light strings as shown in Figure Q5.22. What is the tension T in the angled string? A. 9.5 N B. 15 N C. 20 ND. 26 NE. 30 N FIGURE Q5.22 50° m = 2.0 kg
a. A 0.60 kg bullfrog is sitting at rest on a level log. How large is the normal force of the log on the bullfrog? b. A second 0.60 kg bullfrog is on a log tilted 30 above horizontal. How large is
While standing in a low tunnel, you raise your arms and push against the ceiling with a force of 100 N. Your mass is 70 kg. a. What force does the ceiling exert on you? A. 10 N B. 100 N C. 690
A 5.0 kg dog sits on the floor of an elevator that is accelerating downward at 1.20 m/s2. a. What is the magnitude of the normal force of the elevator floor on the dog? A. 34 N B. 43 N C. 49 ND.
A 3.0 kg puck slides due east on a horizontal frictionless surface at a constant speed of 4.5 m/s. Then a force of magnitude 6.0 N, directed due north, is applied for 1.5 s. Afterward, a. What is
A rocket in space, initially at rest, fires its main engines at a constant thrust. As it burns fuel, the mass of the rocket decreases. Which of the graphs in Figure Q5.26 best represents the velocity

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