Sound cannot travel through a vacuum. Explain why.

A 1000 kgkg car pushes a 2000 kgkg truck that has a dead battery. When the driver steps on the accelerator, the drive wheels of the car push against the ground with a force of 4500 NN.

which of the following statements are true? a) light waves are not true waves. b) sound waves can travel through liquids. c) waves can only move matter up and down or from side to side. d) sound waves cannot travel through empty space.

The speed of light in a diamond is 1.22 x 108 m/s. Calculate the index of refraction for a diamond.

Which of the following situations demonstrates balanced forces? A. a child on a moving seesaw B. a car driving on a straight freeway at 60 miles per hour C. a clock's pendulum in motion D. a rock thrown upward, being acted on by gravity

What's the momentum of a 3.5-kg boulder rolling downhill at 5 m/s?

As stream velocity decrease, which factor will likely increase? A) erosion of the stream bank B) deposition of material in the stream C) amount of material carried downstream D) size of the particles carried downstream

What cells in the nervous signals travel through the nervous system

A mechanic pushes a 3.60 ✕ 103-kg car from rest to a speed of v, doing 5,130 j of work in the process. during this time, the car moves 21.0 m. neglecting friction between car and road, find v and the horizontal force exerted on the car.

Anika asks Eva to roll a basketball and then a bowling ball to her. Which requires more force to roll, and why?

Why does a buoyant force act on every object in a fluid? Pressure pushing up on the bottom of the object is greater than the pressure pushing down on the top.