Suppose a vacuum cleaner use 120 j of electrical energy. If 45 j are used to pull air into the vacuum cleaner, how efficient is the vacuum cleaner?

A 24.0-kg block is initially at rest on a horizontal surface. a horizontal force of 73.0 n is required to set the block in motion, after which a horizontal force of 65.0 n is required to keep the block moving with constant speed.

Explain why the dissolution of a crystalline particle in a solution can be speeded up by (a) stirring the solution and (b) by crushing the particle, from a mass transfer perspective.

During the formation of sex cells, the number of chromosomes after meiosis I is ...

How much energy must be added to a bowl of 125 popcorn kernels in order for them to reach a popping temperature of 175°C?

What is the wavelength of a 256 hertz sound wave in air at stp

In a bizarre but harmless accident, a watermelon fell from the top of the Eiffel Tower. How fast was the watermelon traveling when it hit the ground 7.80 seconds after falling?

If an element has the atomic mass (a) of 80 and its atomic number (z) is 35, how many neutrons does it have?

A ball is thrown up into the air with an initial velocity of 64 ft/sec. The ball is 4 ft above the ground when it is released. Its height, in feet, at time t seconds is given by: h (t) = - 16t^2 + 64t + 4.

Total these measurements. Your answer should indicate the proper accuracy. Be sure to include the units in your answer.

What is vector quantities?