The enthalpy of fusion of ice is 330,000 J/kg. If I have a 1 kg sample, how much energy is needed to melt all of it?

A. 33,000 J

B. 3,300 J

C. 330,000 J

D. 330 J

A balloon drifts 30 m toward the east in 10 s; then the wind suddenly changes and the balloon flies 50 m toward the west in the next 5 s. What was its displacement during the first 10 s?

How does kinetic energy potential energy, and friction affect a skate track design?

A 5kg box is pulled by a rope with a force of 5N in the horizontal direction at a constant speed. What is the friction force between the box and the floor?

How to find the force

Could plant roots do photosynthesis? Give reasons for your answer.

The acceleration of an object is proportional to which of the following? the mass the energy of the object the inverse of the mass the inverse of the force applied

Suppose you squeeze a sponge into a small ball. does the mass of the sponge change? Does it's density change?

A solid round bar with diameter of 2-in has a groove cut to a diameter of 1.8-in, with a groove radius of 0.1-in. the bar is not rotating.

If a pilot pulls her 12.0 kg rollaboard suitcase along the ground with a force of 25. N for 10 M. The handle she pulls on makes an angle of 36.5 degrees with the horizontal. How much work does she do over the ten meter distance?

What happens to the density when water is poured into a empty glass?