If element X has 78 protons, how many electrons does it have?

Which of the following does NOT use a turbine? A. Windmills B. Nuclear power plants C. Solar panels D. Geothermal generation station

During a thunderstorm, a plasma channel forms between the negatively charged clouds and the positively charged Earth, which creates lightning. When lightning is observed, what has passed through the plasma channel

An impala is an African antelope capable of a remarkable vertical leaf. In one recorded leap, a 45 kg impala went into a deep crouch, pushed straight up for 0.21 s, and reached a height of 2.5 m above the ground.

A 275 g block of ice at - 10.0°C is released from rest on a 32.0° incline. After 7.00 s, it has traveled 12.5 m. If all the work done by friction between the ice and the incline is converted to heat, what is the change in temperature of the ice?

Give several examples of a mechanism, machine or system that has two or more simple machines working together to complete work.

Tarzan runs at 6 m/s and grabs a vertical vine (negligible mass) 4.1 m long which is tied to a tree at the top. Tarzan swings up. Determine the maximum height Tarzan will swing up and the angle the vine makes respect to vertical.

What is the safest place to be amid the coronavirus?

What is the change in internal energy if 60 J of heat are added to a system and the system does 40 J of work on its surroundings? Use AU = Q-W.

A 35-N bucket of water is lifted vertically 3.0 m and then returned to its original position. How much work did gravity do on the bucket during this process?

You then decide to throw another disc to your friend in the tree for fun. If you throw the disc at a speed of 10 m/s and your friend catches it 5.0 m above you, what was the speed of the disc just before your friend catches it