How many atoms of hydrogen are represented by the formula:

A) 1

B) 4

C) 8

D) 28

A jet plane is flying at a constant altitude. at time t1=0 it has components of velocity vx = 94 m/s, vy = 110 m/s. at time t2 = 33.5 s the components are vx = 175 m/s, vy = 45 m/s. part a for this time interval calculate the average acceleration.

Part A By what distance do two objects carrying 1.0 C of charge each have to be separated before the electric force exerted on each object is 4.0 N? Express your answer with the appropriate units.

Which of the following requirements must be present to hear a sonic boom? A) all of the listed answers B) constructive interference C) the doppler effect D) The velocity of the airplane must be greater than the speed of sound

Which properties can be used to determine whether a substance is a liquid or a plasma? Check all that apply.

Weight is a force that depends on mass and: * A. friction B. gravity C. magnetism D. energy conservation

For a fixed amount of gas, if the absolute temperature of the gas is doubled, what happens to the pressure of the gas?

A 500-kilogram sports car accelerates uni- formly from rest, reaching a speed of 30 me- ters per second in 6 seconds. What distance has the car traveled during the 6 seconds?

What is efficiencywhat is the formula of mechanical advantage and velocity ratio of labour

What is the wavelength of an ekectromagnetic wave that has a frequency of 40,000 hz? the speed of light is 3x10^8 m/s?

Witch of the following is an example of a pull