The force between two moving objects that are touching

The energy that is produced by the Sun is made by A) fusion. B) fission. C) friction. D) burning fuels.

A 50-g ball rolls across a table at 2 m/s. A 100-g ball rolls across the same table at 1 m/s. Which ball has more momentum? a. 50-g Ball b. 100-g ball c. They have the same momentum

The froghopper, Philaenus spumarius, holds the world record for insect jumps. When leaping at an angle of 58.0∘ above the horizontal, some of the tiny critters have reached a maximum height of 58.7 cm above the level ground.

When air is inhaled, it quickly becomes saturated with water vapor as it passes through the moist upper airways. when breathing dry air, about 25 mg of water are exhaled with each breath.

47. A car travels 85 km in the first half hour of a trip. The car continues to travel for 2 more hours and travels 200 km. What was the average speed of the car for the trip? a. 39 km/h b. 95 km/h c. 114 km/h d. 285 km/h

A boulder on the mythical planet mongo drops off a cliff and falls from rest 1000 m in 10.0 s. (A) what's the initial speed of the Boulder? (B) determine the acceleration due to gravity on mongo. Ignore friction.

The half-life of carbon-14 is 5730 years. How long will it take for the number of carbon-14 nuclei in a sample to drop to a quarter of the original number? Enter your answer as a number years

Which object has more thermal energy a bowl of soup or pot of soup

When you look into a clear pond, a fish may appear to be in a different position than it actually is. What is this caused by? A. diffraction B. dispersion C. refraction D. reflection,

How long would it take to drive to alpha centauri (4.4 light-years away) ?