Why does it take more force to move a heavy box up a ramp than to move the same box down the ramp

A block of iron of volume 50 cm has a mass of 390 g. what is the density of iron

Select the correct answer. The motion of a car on a position-time graph is represented with a horizontal line. What does this indicate about the car's motion? А. It's not moving B. It's moving at a constant speed.

A wave is turned back when it meets the boundary of the medium in which it is traveling. The wave is said to have undergone 1. reflection. 2. diffraction. 3. refraction. 4. interference.

The useful power output of the engine is 2.0 kw. Calculate the rate at which energy is absorbed from the hot reservoir.

Which planet is covered with red, iron-oxide dust? A. Mercury B. Venus C. Earth D. Mars

Friction is a force that speeds up motion between two surfaces that are in contact

Which actions are evidence that a chemical reaction has occurred? Check all that apply. A: a change in color B: the formation of a precipitate C: a clear liquid becoming cloudy D: a change in shape E: the formation of bubbles F: the formation of

Which sphere forms Earth's outermost layer? Atmosphere Biosphere Cryosphere Hydrosphere

an 100kg object traveling at 50m/s collides (perfectly inelastic) with a 50kg object initially at rest. what is the sum of the momentum of both objects prior to the collision?

A train moves at constant velocity of 50km/h. how far will it move in 0.5h?