Which force causes an object to free fall

a) wind

b) fluid forces

c) friction

d) gravity

Which circuit component is usually a device that uses electrical energy to to perform a certain function? A. wire B. power source C. load

Billy goes ice skating with his friend Sally. While they are both standing on the ice before skating Billy pushes Sally. What is Billy's (m = 55 kg) velocity after he pushes Sally if Sally has a mass of 45 kg and moves off at 2.5 m/s?

A radar astronomer who is new at the job claims she beamed radio waves to Jupiter and received an echo exactly 48 min later. Should you believe her? Why or why not?

Nearly all the visible light we see from the sun is emitted from the

You are traveling in a spaceship at a speed of 0.70c away from Earth. You send a laser beam toward the Earth traveling at velocity c relative to you. What do observers on the Earth measure for the speed of the laser beam?

In any food chain or web, the original source of energy is

Which organisms develop gills from pharyngeal arches and later develop lungs to breathe on land

How much energy (in joules) is required to evaporate 0.0005 kg of liquid ammonia to vapor at the same temperature?

It is 5.5 km from your home to the physics lab. As part of your physical fitness program, you could run that distance at 10 km/h (which uses up energy at the rate of 700 W), or you could walk it leisurely at 3.0 km/h (which uses energy at 290 W).

The largest volcanic structures on venus are called: