Energy/work/power

A girl on a motorbike passes by at a speed of 15 m/s. Her mass is 40 kg. What is her kinetic energy? 

• 300 Joules
• 600 Joules
• 950 Joules
• 4500 Joules

Tags

NGSS.MS-PS3-1

Calculate the potential energy of a roller coaster at the top of a 72 m hill that has a mass of 112 kg.

• 80640 J

• 790,720 J

• 8,640 J

• 790,700 J

Tags

NGSS.MS-PS3-2

Which character has the greatest gravitational potential energy?

• Character A
• Character B
• Character C
• Character D

Tags

NGSS.MS-PS3-2

Which skier has the greatest kinetic energy?

• Skier A
• Skier B
• Skier C
• Skier D

Tags

NGSS.MS-PS3-5

NGSS.MS-PS3-1

According to the Law of Conservation of Energy, energy cannot be _________ or ____________. 

• destroyed, destroyed
• created, saved
• created, destroyed
• lost, found

Tags

NGSS.MS-PS3-5

NGSS.MS-PS3-2

What is the KE at the bottom?

• 15,000 J

• 3,750 J

• 7,500 J

• 11,250 J

Tags

NGSS.MS-PS3-5

NGSS.MS-PS3-1

Pratik can carry 300N load and walks a distance of 100m in 50 seconds. What is the power of Pratik?

• 600 W

• 1000000 W

• 400 W

• 25 W

Tags

NGSS.MS-PS3-5

NGSS.MS-PS3-4

A kid applies a force of 60 N to a ball over 1.2 meters. How much work did he do on the ball? 

• 77 J

• 72 J 

• 0.7 J 

• 772 J 

Tags

NGSS.MS-PS3-5

NGSS.MS-PS3-4

A weightlifter lifts three 300 newton weights 1.5 meters off the ground. How much work has he done?

• 900 J 

• 450 J

• 1350 J 

• 1200 J 

You do 90 joules of work in 20 seconds. How much power have you generated?

• 45 watts

• 4.5 watts

• 3 watts

• 30 watts