11.M1.Q2.Review

*Application of Newton's Laws*

Two monkeys of equal mass are holding onto a single

vine of negligible mass that hangs vertically from a

tree, with one monkey a few meters higher than the

other. What is the ratio of the tension in the vine above

the upper monkey to the tension in the vine between

the two monkeys?

• 1

• 1/2

• 1.5

• 2

• More information is required

*Application of Newton's Laws*

An object of unknown mass experience the following forces: F1 = 40 N east; F2 = 50 N north; F3 = 70 N west; and F4 = 90 N south.

What is the magnitude of the net force on the object?

• 50 N

• 70 N

• 131 N

• 170 N

• 250 N

*Applications of Newton's Laws*

Which of the following statements is true?

• An astronaut’s weight is the same on the Moon as on Earth

• An astronaut’s mass is the same on the International Space Station as it is on Earth.

• Earth’s gravity has no effect on astronauts inside the International Space Station.

• An astronaut’s mass is greater on Earth than on the Moon.

• None of these statements are true.

"Applications of Newton's Laws*

A 150-N bird feeder is supported by three cables as shown in Figure P4.19. What is the tension in the upper left cable?

• 150 N

• 75 N

• 130 N

• 100 N

* Work & Energy*

A worker pushes a wheelbarrow 5.0 m along a level surface, exerting a constant horizontal force of 50.0 N. If a frictional force of 43 N acts on the wheelbarrow in a direction opposite to that of the worker, what net work is done on the wheelbarrow?

• 250 J

• 215 J

• 35 J

• 15 J

• 45 J

*Work & Energy *

A 40.0-N crate starting at rest slides down a rough 6.00-m-long ramp, inclined at 30.0° with the horizontal. The magnitude of the force of friction between

the crate and the ramp is 6.0 N. What is the speed of

the crate at the bottom of the incline?

• 1.6 m/s

• 3.32 m/s

• 4.5 m/s

• 6.42 m/s

• 7.75 m/s

*Work & Energy*

A 70-kg base runner begins his slide into second base when he is moving at a speed of 4.0 m/s. The coefficient of friction between his clothes and Earth is 0.70. He slides so that his speed is zero just as he reaches the base. How much mechanical energy is lost due to friction acting on the runner?

• 560 J

• -560 J

• 56 J

• -56 J

• 5600 J

*Momentum & Collisions*

A soccer player runs up behind a 0.450-kg soccer ball traveling at 3.20 m/s and kicks it in the same direction

as it is moving, increasing its speed to 12.8 m/s. What

magnitude impulse did the soccer player deliver to the

ball?

• 2.75 kg.m/s

• 4.32 kg.m/s

• 5.61 kg.m/s

• 7.08 kg.m/s

• 9.79 kg.m/s

* Momentum & Collisions*

If two particles have equal kinetic energies, are their momenta equal?

• yes, always

• no, never

• yes, as long as their masses are equal

• yes, as long as both mass and direction are the same

• no, unless they are traveling perpendicularly

*Newton, Kepler and Gravity*

The gravitational force exerted on an astronaut on Earth’s surface is 650 N down. When she is in the International Space Station, is the gravitational force on her is

• larger

• smaller

• exactly the same

• zero

• nearly, but not exactly zero