A child pushes a toy car down a hill. After 5 seconds, the car has a kinetic energy of 115 J and a gravitational potential energy of 30 J. What is the car's mechanical energy at that time?

A) 3.9 J

B) 85 J

C) 115 J

D) 145 J

When the light source is turned on, the scientist observes that no light is detected on the far side of the substance. What is the best interpretation for this observation?

A 1500-W heater is connected to a 120-V line. How much heat energy does it produce in 2.0 hours? Hint: how are power and energy related?

ou are looking for a new tennis partner. Which of these people would most likely demonstrate good sportsmanship based on the information provided?

How does the turbine make electricity

Love, which can't be observed or measured directly, is an example of a psychological construct. a. True b. False

All matter we encounter in everyday life exists in one of three physical formss True or False.

15 grams of liquid plastic are frozen in a physical change that increases the volume. What can be known about the plastic after the change?

A Car is lifted a certain distance in a service station and therefore has potential energy relative to the floor. if it was lifted twice as high, how much potential energy would it have?

How long does it take a 750-w coffeepot to bring to a boil 0.75 l of water initially at 11°c? assume that the part of the pot which is heated with the water is made of 280 g of aluminum, and that no water boils away?

An electric motor rotating a workshop grinding wheel at a rate of 151 rev/min is switched off. Assume constant angular deceleration of magnitude 2.23 rad/s 2. Through how many revolutions does the wheel turn before it finally comes to rest