A professional cyclist rides a bicycle that is 92 percent efficient. For every 100 joules of energy he exerts as input work on the pedals, how many joules of output work are used to move the bicycle?
Which of the following processes is not a physical change:drying wet clothes,cutting snowflakes out paper,lighting a match from a matchbook?
Blaine skis down a hill at an angle of 12°. He has a mass of 82 kg. What is the normal force on Blaine?
On the seashore, pebbles that are rough and uneven become smooth and rounded. Explain how the become smooth and rounded.
Balance following equation then classify the reaction as synthesis (s)decomposition (d) single replacement (SD)double replacement (DD )or combustion(c) ___h2+__O2 ➡___H2O Classify___
Workers load a 500kg safe onto an elevator that lifts it 90m to the twentieth floor of a building. How much work did the elevator do on the safe?
A 2,000-kilogram car uses a braking force of 12,000 Newton to stop in 5 seconds. What is its initial speed of the car?
A cheetah can run at approximately 100 km/hr and a gazelle at 80 km/hr. If both animals are running at full speed, with a gazelle 70 m ahead, how long before the cheetah catches its prey?
