Questions and Answers of College Physics A Strategic Approach 2nd

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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