Physics Test 7

An object rolls down a ramp as shown. The mass of the object is 3.0 kg. What is the kinetic energy of the object when it is halfway down the ramp.

• 50 J

• 25 J

• 100 J

• 0 J

The mass of the coaster car shown below is 250 kg. Point 1 is 100.0 m above the ground. Point 3 is 55 m above the ground. The speed at point 3 is 27.0 m/s. Calculate the total mechanical energy of the system.

• 245 000 J

• 392 000 J

• 176 000 J

• 56 000 J

The drawing represents a roller coaster car at different positions on a track. At which of these positions on the track was the kinetic energy being transformed into potential energy for the roller coaster car?

• at both A and C

• B

• D

• at both B and C

After beginning his run, at which of the following points on the ski slope is the skier moving the slowest?

• X

• Y

• Z

How much work is being done on this box? HINT: W = Fd

• 500 J

• 1500 J

• 3.0 J

• 1000 J

At which point does the ball have both potential and kinetic energy?

• A

• B

• C

• D

A baseball player pitches a 0.16-kg baseball at 14 m/s. Calculate the kinetic energy for the baseball.

• 15.68 J

• 7.03 J

• 23.9 J

• 11,01 j

A 1200-kg car is moving northward at a velocity of 18 m/s. What is the car’s momentum (p)? HINT: p = mv

• 32 200 north

• 21 600 north

• 27 500 north

• 16 600 north

A 5.0 kg ball is rolling down a hill at a velocity of 3.5 m/s. What is its kinetic energy? HINT: KE = 1/2 mv²

• 30.63 J

• 18.75 J

• 42.56 J

• 37.98 J

A soccer ball with a mass of 0.50 kg is suspended 2.0 meters above the ground. What is its gravitation potential energy? HINT: PE = mgh, where g= 9.8 N/kg

• 9.8 J

• 6.32 J

• 5.95 J

• 10.7 J