How is sound energy produced

A. Vibrating objects

B. objects being heated

C. Temperature differences

D. Stationary objects

If the loss of 3500 kcal is equal to a loss of 1.0 lb, how many days will it take charles to lose 5.0 lb

How much work is done to move 2.10 μC of charge from the negative terminal to the positive terminal of a 3.50 V battery?

A magnifying glass or a hand lens is a bi-convex lens. It is convex on both sides, meaning that the glass is curved outward to form a dome. Things look bigger looking through convex lenses.

A wheel rotates without friction about a stationary horizontal axis at the center of the wheel. A constant tangential force equal to 80 N is applied to the rim of the wheel. The wheel has radius 0.12 m.

Leanne is riding a bike. The forward force from her pedalling is 18N. There is a backward force of 6N from friction and a backward force of 12N from air resistance. Does the speed of the bike increase, decrease or not change?

Which best blocks X-ray particles and can therefore be observed more closely through the use of this technology?

A light ray travels inside a horizontal plate of glass, striking its upper surface at an angle of incidence of 50°. This ray is totally internally reflected at the glass-air boundary. A liquid is then poured on top of the glass.

A stationary object has no forces acting on it. True False

April swims 50 m north and then turns and swims 20 m back to the south. What is her velocity if it takes her 60 seconds?

What happens to the mass of an object when it is cooled?