My little brother makes a ramp to push his toy dump truck to his sandbox

A 1400 kg wrecking ball hangs from a 20-m-long cable. the ball is pulled back until the cable makes an angle of 30.0 ∘ with the vertical. part aby how much has the gravitational potential energy of the ball changed?

A glass rod that has been charged to + 12.0 nC touches a metal sphere. Afterward, the rod's charge is + 8.0 nC.

Which visible colors of light has the longest wavelength?

What type of system allows matter and energy to enter and exit? O A. Connected ов. Open O c. Closed O D. Isolated

Zach, whose mass is 80 kg, is in an elevator descending at 10 m/s. The elevator takes 3.0 s to brake to a stopat the first floor. a. What is Zach's apparent weight before theelevator starts braking? b.

Which statement is correct about gasoline when it is burned? Heat energy is created by the gasoline. The total energy of the gasoline decreases. Chemical energy in the gasoline is destroyed. Chemical energy is transformed into heat energy.

The tilt of the Earth's axis of rotation changes over a period of 41,000 years. Which of these statements best predicts a long term effect of the changes in the tilt of the Earth's axis of rotation? a. The Earth's climate would change. b.

What do keratinized cells form?

Explain why Planck's introduction of quantization accounted for the properties of black-body radiation.

How and which waves travel either through a medium or a vacuum?