A student slides a book across a desk, with a velocity of + 8 m/s. When her friend catches the book, it has a velocity of + 7.4 m/s. If the acceleration was a constant - 5.6 m/s2, how wide is the desk?

How many significant figures are in the following measurements? a. 300000000m/s b. 3.00x10 (8th power) c. 25.030*c d. 0.006070 * c e. 1.004 J f. 1.30520 MHz

The molecular weight of oxygen gas (o2) is 32 while that of hydrogen gas (h2) is 2. prove that under same physical conditions, the velocity of sound in hydrogen is four times that in oxygen

The space shuttle is descending through the earth's atmosphere. How is the mass of the shuttle affected? A. It will remain constant. B. It will increase with descent. C. It will decrease with descent.

Can a falling object reach terminal velocity in outer space?

Which of the following is true about radio waves? they have short wave lengths they can penetrate dust clouds they have high energies they reveal hot gasses

When an atom loses an electron, it becomes a a. positive ion. b. negative ion. c. neutral ion. d. neutral atom.

A hydraulic lift has two pistons: a small one of cross-sectional area 5.00 cm2 and a large one of cross-sectional area 300 cm2. What minimum force must be applied to the small piston in order for the large piston to lift a truck of mass 4500 kg

What is the meaning of the phrase "grand unified theories" when applied to particle physics and cosmology?

A 26.0 kg wheel, essentially a thin hoop with radius 1.30 m, is rotating at 297 rev/min. It must be brought to a stop in 23.0 s. (a) How much work must be done to stop it? (b) What is the required average power? Give absolute values for both parts.

A net force of 200 newton's is applied to a wagon for 3 seconds. this causes the wagon to undergo a change in momentum of