A train travels 76 kilometers in 2 hours and then 54 kilometers in 5 hours. What is the average speed?

A 36N force applied vertically upwards on an object causes it to accelerate at 2.0m/s2. What is the object's mass?

Do you think you could identify a mystery substance using only its mass or weight? Explain your answer.

Scientists use a substance called Iodine-131 to treat cancer. As Iodine-131 undergoes radioactive decay and emits beta particles, it kill cancer cells.

An object weighs 15N in air and 13N when completely submergedin water. What is the volume of water displaced by thesubmerged ofject?

Important minerals such as copper are found in what? (More info: which are combinations of many minerals)

4. How far does a car travel in 90 seconds if it is traveling at a speed of 55 m/s?

Total energy input is 1400 and my efficiency is 80% so what is the useful energy output in jules?

What is the force of gravity acting on a 2000-kg spacecraft when it orbits two Earth radii from the Earth's center (that is a distance r=6380 km above the Earth's Surface. The mass of the Earth is 5.98 x 1024 kg.

An LC circuit has a 6.00 mH inductor. The current has its maximum value of 0.570 A at t = 0s. A short time later the capacitor reaches its maximum potential difference of 66.0 V. What is the value of the capacitance?

The first law of thermodynamics states that ΔE = Q - W. Is this also a statement of the principle of conservation of energy? Yes, the heat added and the change in internal energy of the gas equal the work done by the piston.