Physics: Motion in Two Dimensions - Part 1

While racing on a flat track, a car rounds a curve of 28 m radius and instantaneously experiences a centripetal acceleration of 18 m/s2 . How fast was the car going? 5.0 × 10^2 m/s 12 m/s 1.0 × 103 m/s 22m/s

22m/s

What is the centripetal acceleration of a jet making a turn with a radius of 0.50 km at a speed of 343 m/s? 235 m/s^2 0.69 m/s^2 2.35×10^5m/s^2 686 m/s^2

235 m/s^2

Which force produces the largest torque? 20.0 N perpendicular to the center of rotation at a radius of 0.5 m 20.0 N perpendicular to the center of rotation at a radius of 1.0 m 10.0 N perpendicular to the center of rotation at a radius of 0.25 m 10.0 N perpendicular to the center of rotation at a radius of 1.5 m

20.0 N perpendicular to the center of rotation at a radius of 1.0 m

A placekicker kicks a football at an angle of 20°. At what angle will the football hit the ground? 20° 45° 60° 90°

20º

Which force produces the smallest torque? 20.0 N perpendicular to the center of rotation at a radius of 0.5 m 20.0 N perpendicular to the center of rotation at a radius of 1.0 m 10.0 N perpendicular to the center of rotation at a radius of 0.25 m 10.0 N perpendicular to the center of rotation at a radius of 1.5 m

10.0 N perpendicular to the center of rotation at a radius of 0.25 m

The moon's gravity is one-sixth that of the earth. What is the period of a 0.25 m long pendulum on the moon? 3.5 s 2.5 s 0.32 s 1.0 s

2.5 s

If the ball shown in the figure lands in 2.0 s, about what height was it thrown from? 20 m 5 m 25 m 1 m

20 m

How long is a pendulum with a period of 1.0 s on a planet with twice the gravity of the earth? 0.15 m 0.20 m 0.10 m 0.041 m

0.041 m

If you attach a 50.0 g mass to the spring whose data are shown in the graph, what will be the period of its oscillations? 13 s 8.9 s 0.28 s 1.4 s

0.28 s

A position-time graph of a spring is shown here. What is the approximate amplitude of the spring's motion? 0.1 m 0.2 m 0.4 m 0.3 m

0.2m

A position-time graph of a spring is shown here. What is the frequency of the spring's motion? 0.1 Hz 2.0 Hz 3.0 Hz 0.33 Hz

0.33 Hz

What is the frequency of motion of a 2.0 m long pendulum? 0.61 Hz 0.35 Hz 1.3 Hz 2.84 Hz

0.35 Hz

If you attach a 100.0 g mass to the spring whose data are shown in the graph, what will be the period of its oscillations? 1 x 10^1 s 6 x 10^-1 s 2 s 0.4 s

0.4 s

A spring has a spring constant of 100 N/m , and the mass hanging on it is 0.50 kg. What is the period of the spring's motion? 0.53 s 0.031 s 0.44 s 1.0 s

0.44 s

A 0.80 m wide door turns though an angle of 35°. How long is the arc of the displacement? 1.0 m 0.80 m 0.49 m 0.63 m

0.49 m

How long is a pendulum with a period of 1.0 s on a planet with twice the gravity of the earth? 1.0 m 0.25 m 0.50 m 0.10 m

0.50 m

An outfielder throws a baseball to home plate with a velocity of +15 m/s and an angle of 20°. When will the ball reach its highest altitude? 1.2 s 0.98 s 1.5 s 0.52 s

0.52 s

A spring has a spring constant of 100 N/m , and the mass hanging on it is 0.71 kg. What is the period of the spring's motion? 0.53 s 0.031 s 0.44 s 1.0 s

0.53 s

What is the frequency of motion of a 0.67 m long pendulum? 0.61 Hz 0.35 Hz 1.3 Hz 2.84 Hz

0.61 Hz

A 0.90 m wide door turns though an angle of 45°. How long is the arc of the displacement? 0.90 m 0.80 m 0.45 m 0.71 m

0.71 m

An outfielder throws a baseball to home plate with a velocity of +15 m/s and an angle of 40°. When will the ball reach its highest altitude? 1.2 s 0.98 s 1.5 s 0.50 s

0.98 s

What is the centripetal acceleration of a jet making a turn with a radius of 0.75 km at a speed of 343 m/s? 1.6 x 10^5 m/s^2 2.35 m/s^2 1.6 ×10^2m/s^2 343 m/s^2

1.6 ×10^2m/s^2

A placekicker kicks a football at an angle of 30°. At what angle will the football hit the ground? 30° 45° 60° 90°

30º

While racing on a flat track, a car rounds a curve of 56 m radius and instantaneously experiences a centripetal acceleration of 18 m/s2 . How fast was the car going? 1.0 × 102 m/s 32 m/s 1.0 × 103 m/s 840 m/s

32 m/s

If you throw a ball at 35° and 5 m/s , what is the horizontal component of velocity? 2.0 m/s 0.0 m/s 5.0 m/s 4.1 m/s

4.1 m/s

If you throw a ball at 25° and 5 m/s , what is the horizontal component of velocity? 2.0 m/s 0.0 m/s 5.0 m/s 4.5 m/s

4.5 m/s

If the ball shown in the figure lands in 1.0 s, about what height was it thrown from? 20 m 5 m 25 m 1 m

5 m

The moon's gravity is one-sixth that of the earth. What is the period of a 2.00 m long pendulum on the moon? 2.8 s 3.5 s 2.5 s 7.0 s

7.0 s

A car decelerates from 20 m/s to 10 m/s . Which of the following statements is true? A net torque acts on the wheels in their direction of motion. No net torque acts on the wheels at all. A net torque acts on the wheels opposite their direction of motion. You cannot tell from the information given.

A net torque acts on the wheels in their direction of motion.

A car decelerates from 20 m/s to 10 m/s . Which of the following statements is true? A net torque acts on the wheels in their direction of motion. No net torque acts on the wheels at all. A net torque acts on the wheels opposite their direction of motion. You cannot tell from the information given.

A net torque acts on the wheels opposite their direction of motion.

An archer shoots an arrow horizontally and his friend drops a bowling ball from the same height when the arrow is released. In the absence of air resistance, which of the following happens? You cannot tell from the information given. The bowling ball hits the ground first. The arrow hits the ground first. Both hit the ground at the same time.

Both hit the ground at the same time.

An archer shoots an arrow horizontally and his friend drops a penny from the same height when the arrow is released. In the absence of air resistance, which of the following happens? You cannot tell from the information given. The penny hits the ground first. The arrow hits the ground first. Both hit the ground at the same time.

Both hit the ground at the same time.

A CD spins at a constant angular velocity of 4.0 revolutions per second clockwise. Which of the following statements about the CD is true? A net torque acts on it clockwise to keep it moving. A net torque acts on it counterclockwise to keep it moving. No net torque acts on it at all.

No net torque acts on it at all.

A CD spins at a constant angular velocity of 5.0 revolutions per second counterclockwise. Which of the following statements about the CD is true? A net torque acts on it clockwise to keep it moving. A net torque acts on it counterclockwise to keep it moving. No net torque acts on it at all.

No net torque acts on it at all.

Two identical pendulums are on the surface of Mars and Earth. The period of the Mars pendulum is longer than the one on Earth. Why? There is more friction from the martian atmosphere. The rotation of Mars affects a pendulum more than on Earth. The acceleration due to gravity on Mars is greater than that on Earth. The acceleration due to gravity on Mars is less than that on Earth.

The acceleration due to gravity on Mars is less than that on Earth.

For the seesaw depicted in the diagram, which of the following will happen? The seesaw will rotate counterclockwise. The seesaw will rotate clockwise. The seesaw will remain balanced. You cannot tell from the information provided.

The seesaw will rotate clockwise.

In the figure, which arrow designates a factor that the period of the pendulum's motion depends on? arrow A arrow B arrow C arrow D

arrow A

In the figure, a washer on a string (string not shown) moves in the circular path shown in red. Which arrow best describes the direction of the centripetal acceleration of the washer at that instant in time? arrow A arrow B arrow C arrow D

arrow C

In the figure, a washer on a string (string not shown) moves in the circular path shown in red. Which arrow best describes the direction of the force acting on the washer at that instant in time? arrow A arrow B arrow C arrow D

arrow C

In the figure, which arrow designates the amplitude of the pendulum's motion? arrow A arrow B arrow C arrow D

arrow D

How would you decrease the period of the spring whose motion is shown in the graph? increase the initial displacement of the spring decrease the initial displacement of the spring increase the mass hanging from the spring decrease the mass hanging from the spring

decrease the mass hanging from the spring

For a spring oscillating in simple harmonic motion, at what point will the velocity of the spring be greatest? half of maximum positive amplitude maximum positive amplitude maximum negative amplitude equilibrium point

equilibrium point

What force causes centripetal acceleration of a car making a turn on a flat road? gravity friction weight normal force

friction