polymers can be produced in large quantities at low cost.

Halley's comet orbits the sun roughly once every 76 years. It comes very close to the surface of the Sun on its closest approach. Estimate the greatest distance of the comet from the sun.

An airplane begins its take-off run at A with zero velocity and a constant acceleration a. Knowing that it becomes airborne 30 s later at B with a take-off velocity of 270 km/h, determine (a) the acceleration a, (b) distance AB.

The reason an electric current can create a magnetic field is due to the phenomenon of

A football player with a mass of 85 kg wears a uniform and helmet that have a mass of 4.5 kg. The football player moves at 2.1 m/s. What is the total momentum of the football player and uniform?

Explain how speed, velocity, and acceleration are related. Be sure to include both similarities and differences in your explanation.

Stephen can push with 200N of force on a couch. If the couch has a mass of 20 kg, how much acceleration will the couch have?

Which devices might use electromagnets? pick all that apply. 1. audio speakers 2. plastic combs 3. trains 4. doorbells 5. revolving chairs 6. cranes

Match each type of line or symbol, common to geologic maps, to its description. 1. Fault Line A. very dark and thick line 2. Contact Line B. very light and thin line 3. Axis Fold C. look like a stubby T 4. Strike and Dip D.

You drop your backpack out of a window from a height of 8.3 m. What is the impact speed of your backpack? A. 163 m/s B. 1.2 m/s C. 21.3 m/s D. 12.8 m/s

What is the kinetic energy of a car that has a mass of 1,600 kg and is moving at 22 m/s?