Why should a spacecraft be airtight.

Why do astronauts need to wear pressurized suits in space? a. Because air pressure is so great in space they could be crushed without the suits. b. Because without the pressure in the suits the astronauts could freeze to death. c.

The forces acting on a falling leaf are

What is the specific heat of lead if it takes 96J to raise the temperature of a 75g block by 10oC?

What type of energy does a spinning turbine have? a. electrical energy b. nuclear energy c. thermal energy d. mechanical energy

Which of the following are true for acceleration? A. The symbol used for acceleration is. B. Acceleration is a scalar quantity. C. The SI unit for acceleration is minutes per second. D. Acceleration describes how the velocity changes in time.

If a train going 60 m/s hits the brakes, and it takes the train 1 minute 25 seconds to stop, what is the train's acceleration?

A scientist who performs an experiment has no idea what the outcome of the experiment is going to be. True or False

Why should a truck have an engine that can produce more force than a regular car? A) "Net forces" do not affect cars and trucks the same way.

How does a electron travel through a closed circuit?

Most people can detect frequencies as high as 20 000 Hz. Assuming the speed of sound in air is 345 m/s, determine the wavelength of the sound corresponding to this upper range of audible hearing.