Is the following true or false? Mechanical waves can travel through empty space

Here's a basketball problem: A 87.2 kg basketball player is running in the positive direction at 7.0 m/s. She is met head-on by a 102.0 kg player traveling at 5.2 m/s toward her. If the 102.0 kg player is knocked backwards at 2.

Which cannot be done by a machine A. increase force B. Increase work C. change direction of force D. increase velocity

Apply what you know about forces to hypothesize how balanced and unbalanced forces acting on a moving car would affect the motion of the car.

Where is the solid material left behind in the distillation process

A farmer uses a tractor to pull a 150 kg bale of hay up a 15∘ incline to the barn at a steady 5.0 km/h. The coefficient of kinetic friction between the bale and the ramp is 0.40. Part A What is the tractor's power output?

When a siren is approaching you, how does the wavelength of the waves reaching you compare to the actual wavelength that the siren emits?

In a harbor, you can see sea waves traveling around the edges of small stationary boats. Why does this happen?

Correct unit of speed

Technician A says that for best results, loosen the fastener immediately after spraying it with penetrating oil. Technician B says that rusted fasteners may be loosened by tapping with a hammer. Which technician is correct? a. technician A only b.

A roller coaster track is 3,000 meters long. It takes 100 seconds to travel once around the roller coaster. Is the velocity constant throughout the trip? Explain.