A 3.90 kg weight is placed on top of a vertical spring, which compresses a distance of 2.87 cm. Calculate the force constant (in N/m) of the spring.

To do work, this truck uses energy stored in chemical fuel and an electrical battery. how much total energy does this truck put out?

Which statements about tornadoes are true? check all that apply. (a) about 12,000 tornadoes hit the united states every year. (b) a tornado looks like a funnel. (c) tornadoes are deadly atmospheric storms that cause millions in damages each year. (d) tornadoes can reach wind speeds of more than 300 miles per hour. (e) kansas is the state with the most tornadoes. (f) you will always notice a funnel before a tornado strikes.

What is a good example of instantaneous speed