How are nuclear chain reactions controlled in nuclear power plants?

A cross country skier can complete a 7.5 km race in 45 minutes. What is the skiers's average speed

Which type of mechanical wave needs a source of energy to produce it? a. a transverse wave b. a longitudinal wave c. a surface wave d. all of the above

A stunt car with a mass of 1,000 kilograms crashes into a tree on a movie set. During the collision, the acceleration of the car was 3 meters/second2. What was the force of impact of the collision on the car?

How to covert ma into amphere?

When you flick a coin so that it slides across a table, what four forces are acting on the coin?

A student examining a joint observes collagen-rich connective tissue fibers linking the bones, but finds no synovial cavity. Which structural classification fits the observed joint?

How to identify additional materials

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.