If the Earth were compressed in such a way that its mass remained the same, but the distance around the equator were just one-half what it is now, what would be the acceleration due to gravity at the surface of the Earth?
A 2500‐kg vehicle traveling at 25 m/s can be stopped by gently applying the breaks for 20 seconds. What is the average force supplied by the breaks to stop the vehicle?
A force F of strength 20 N acts on an object of mass 3 kg as it moves a distance of 4 m. If F is perpendicular to the 4 m displacement, the work it does is equal to how many joules?
A 0.0010-kg pellet is fired at a speed of 50.0m/s at a motionless 0.35-kg piece of balsa wood. When the pellet hits the wood, it sticks in the wood and they slide off together. With what speed do they slide?
A circuit contains a 12-volt battery and two 3-ohm bulbs in series. a. Calculate the total resistance of the circuit. b. Calculate the current in the circuit. c. Calculate the power of each bulb. d. Calculate the power supplied by the battery.
true or false the precision of calculated answers is limited by the least precise measurement used in the calculation
Yvonne has gained a reputation for her cheesecakes. She takes orders for 10 cheesecakes and spends 8.5 hours on one Saturday baking them all. She earns $120 from selling these cheesecakes. a. What is the average length of time to make one cheesecake? Give your answer in minutes. b. What does Yvonne charge for each cheesecake? c. How much money is Yvonnne earning per hour for her work?
The average distance from the sun to Pluto is approximately 6.10 × 109 km. How long does it take light from the sun to reach Pluto? Use the speed of light from the previous question to help you.
A student wants to use indirect measurement to find the thickness of a sheet of newspaper. In a 50-centimeter tall recycling bin, she finds 50 sheets of newspaper. Each sheet in the bin is folded in fourths. Design a procedure for the student to use that would allow her to measure the thickness of one sheet of newspaper with little or no source of experimental error. The student has a meter stick and a calculator.
A rake is held so that its input arm is 0.4 meters and its output arm is 1.0 meters. What is the mechanical advantage of the rake?
An athlete of mass 70.0 kg applies a force of 500 N to a 30.0 kg luge, which is initially at rest, over a period of 5.00 s before jumping onto the luge. Assuming there is no friction between the luge and the track on which it runs, what is its velocity after the athlete jumps on?
