Question

What is the mass of a solid iron wrecking ball of volume 18.0 cm³? Take the density of iron to be 7.80 x 10³ kg/m³. Hint: convert volume to m³.

Select one:

a. 1.91 x 10⁸ kg

b. 2.70 x 10¹¹ kg

c. 1.40 x 10³ kg

d. 0.140 kg

e. 191 kg

Q2: Consider a bed of nails with an upper weight limit of 200 lbs (which corresponds to a weight of 889 N). Each nail has a tip area of 7.85 x 10^-7 m². When a 200-lb man lies down on the bed, the pressure at each nail point is 39.5 PSI. How many nails does the bed have?

Select one:

a. about 6400 nails

b. about 8700 nails

c. about 4160 nails

d. about 1000 nails

e. 4.41 x 10⁷ nails

Q3:What is the difference in blood pressure (in Pascals) between the bottom of the feet and the top of the head of a 1.45-m-tall person standing vertically? Take the density of blood to be 1060 kg/m³.

Select one:

a. 1.18 Pa

b. 136 Pa

c. 1.16x10⁵ Pa

d. 1.51x10⁴ Pa

e. 1.71x 10⁴ Pa

Q4 :Determine the absolute pressure on the bottom of a swimming pool 28.0 m by 8.50 m whose uniform depth is 1.80 m. Also determine the absolute pressure against the side of the pool near the bottom.

Select one:

a. 1.76 x 10⁴ Pa 1.76 x 10⁴ Pa

b. 2.74 x 10⁵ Pa                         1.76 x 10⁴Pa

c. 1.013 x 10⁵ Pa                        1.013 x 10⁵ Pa

d. 1.19 x 10⁵Pa 2.74 x 10⁵ Pa

e. 1.19 x 10⁵ Pa                        1.19 x 10⁵ Pa

The surface of the water in a storage tank is 25.0 m above a water faucet in the kitchen of a house. In other words, the head of water is 25.0 m at the faucet. Calculate the difference in water pressure between the faucet and the surface of the water in the tank. Where is the pressure greater, at the faucet, or at the surface of the water?

Select one:

a. 2.45 x10⁵ Pa faucet

b. 1.013 x 10⁵ Pa surface of the water

c. 136 Pa surface of the water

d. 30.0 Pa faucet

e. 2.94 x 10⁵ Pa faucet

Answer 1