Which type of star is the sun?

red giant

black dwarf

main-sequence

black hole

A student was travelling on a bus and he was standing in the middle portion of the bus. When the bus driver jammed on the brakes, a wooden box hit the student's legs. He claimed that the box came from the front portion of the bus.

Consider the Bohr energy expression (Equation 30.13) as it applies to singly ionized helium He + (Z = 2) and an ionized atom with Z=5 and only a single electron orbiting the nucleus.

True or False: Friction makes energy vanish. Explain your answer!

In whick changes of state do atoms lose energy? Check all that apply

Tall, dense clouds fill the sky during a thunderstorm, bringing hail, lightning, and heavy rain. Which type of clouds are these?

The power that a resistor must dissipate is jointly proportional to the square of the current flowing through the resistor and the resistance of the resistor.

Stress is a factor that contributes to heart disease risk. true or false

What is the difference between cementation and compaction?

Is it possible for a baseball to have as large a momentum as a much more massive bowling ball

A simple pendulum with length 1.6 m and mass 21 kg is pulled 20◦ from the vertical and released. If it is allowed to swing until it comes to rest, how much energy was converted into heat? The acceleration of gravity is 9.8 m/s 2.