A moving object has a kinetic energy of 20 J. if it's velocity doubles, it's kinetic energy would be

1) 40 J

2) 60 J

3) 80 J

4) 100 J

The sound level near a noisy air conditioner is 70 dB. If two such units operate side by side, the sound level near them would be

A 2 kg bowling bowl is 1 meter off the ground on a post when it falls. just before it reaches the ground, it is travelling 4.4 m/s. Assuming there is no air resistance, which of the following statements is true 1.

A group of cells that grow very fast

A singer raises his pitch one octave. what quality of the sound wave has changed? the frequency has increased. the wavelength has increased. the amplitude has increased. the speed has increased.

If two protons and two neutrons are added to the nucleus of a carbon atom, what nucleus does it become?

Which is an example of velocity? a. 5 meters per second northeast b. 25 kilometers c. 15 miles per hour

If a car is traveling at a velocity of + 10m/s suddenly turns around and continues at the same speed, what is its new velocity?

When demand for electric power is high, power company sometimes reduced the voltage, thereby producing a "brown-out." What is being saved?

Secondary evidence is the basis for drawing scientific conclusions is this true ir false

A stone tumbles into a mine shaft and strikes bottom after falling 4.2 seconds. How deep is the mine shaft?