Dana is on a train traveling at a speed of 20 km/h. Dana walks from the front of the train to the back of the train at a speed of 4 km/h. What is Dana's speed relative to the ground?

Which of the following is a true statment? A. Both electric fields and electric forces maintain their strength as the distance increases. B. Electric fields dont change in strengths with distance from a charge, but electric forces do. C.

A satellite of mass m completes one revolution around the earth at a constant speed s and radius r. Which of the following statements are false? a. The centripetal force is directed towards the center and is nonzero. b.

Which simple machines make up scissors

DC versus AC problem. Suppose your DC power supply is set to 15 V and the vertical setting on the oscilloscope is at 5 V/div.

What in the atmosphere hold in the amount of heat needed to keep earth livable

Which of the following is an example of quantitative data? A) The dog slept for 2 hours B) The dog has white feet C) The dog has soft fur

A particle moves along a circle with radius R, so that the tangential component of its acceleration is constant. At t = 0 the velocity of the particle was equal to zero. Find (a) the normal component an of the acceleration as function of time.

What is body dysmorphia?

Which of Newton's laws explains why your hands get red when you press them hard against a wall? A. Newton's law of gravity B. Newton's first law of motion C. Newton's second law of motion D. Newton's third law of motion

A glass plate (n = 1.64) is covered with a thin, uniform layer of oil (n = 1.27). A light beam of variable wavelength from air is incident normally on the oil surface. Observation of the reflected beam shows constructive interference at 501 nm.