1. When a particle moves in a circle with constant speed, its acceleration is

A) constantly increasing.

constant in direction.

C) zero.

D) constant in magnitude.

E) constant in magnitude and direction.

Assuming that the density of a person is the same as the density of water, what buoyant force does the atmosphere exert on a person whose mass is 70 kg?

Without changing the force input, how can force output be increased?

What is the approximate mass of a 200-newton object on earth? A) 20kg B) 100kg C) 200kg D) 1,960kg

A sealed glass jar has a small amount of water on the bottom. the rest of the volume in the jar is taken up by helium gas at a partial pressure of 526 mmhg, and water vapor. if the total pressure inside the jar is 760.

A person who has a mass of 55 kg is standing in an elevator which is accelerating downward. Acceleration due to gravity is 10 m/s2. a) At what rate (in m/s2) must the elevator accelerate for the person to feel weightless

during a crash, an airbag inflates to stop a dummys forward motion. the dummy mass is 75 kg. if the net force is on the dummy is 825 N toward the rear of the car, what is the dumys deceleration

A bike rider starts from rest and accelerates 28.0 meters down a slope in 5.00 seconds. What is her acceleration? Select one: a. 3.21 m/sec2 b. 1.75 m/sec2 c. 9.80 m/sec2 d. 2.24 m/sec2

What is the center of atom called?

Helium is considered a noble gas because it has a _blank___ valence electron shell

Calculate the mass of an 86kg object on the moon