9. The model of the universe that suggests that the sun is the center of the universe was first developed by

A. Copernicus

B. Brahe.

C. Kepler.

D. Ptolemy.

a 3.46 kg box is sitting at rest on a flat floor. a.) what is the weight of the box. b.) what is the normal force on the box

A car moves with 3m/s and travels for 12s. Calculate the distance moved by the car.

Momentum Monster does 600,000 joules of work in 10 seconds. How much power is that in watts? I think it's 60,000, but I need someone who knows for sure whether this is correct or not.

Which portion of the electromagnetic spectrum is used in a microscope? a. infrared waves c. visible light b. gamma rays d. ultraviolet light?

For the first nutcracker, two applied forces of magnitude f were required to crack the nut, whereas for the second, only one applied force of magnitude f was required. how would you explain this difference?

If a pressure gauge measure an increase in 3*10^ (5) Pa on an area of 0.7 m^2, calculate the increase in the force applied to the area?

Which of the following is an example of potential rather than kinetic energy? a. water rushing over Niagara Falls b. a molecule of glucose c. a crawling beetle foraging for food d. light flashes emitted by a firefly

If a force of 15 newtons [N] is applied to a surface and the pressure is measured as 4,000 pascals [Pa], what is the area of the surface in units of square milimeters [mm2 ]?

An engineer has the task of producing an aluminum alloy with a density of 3.0 grams per cubic centimeter. She comes up with the perfect alloy and saves a sample of it. Which mass and volume measurements correspond to this sample? 7 g and 2.

What must be your car's average speed in order to travel 235km in 3.25 hours?