BOROUGH OF CoMMUNITY COLLEGE DEPARTMENT OF SCIENCE Phy 210 Name: Spring 2017 Qui
ID: 1623856 • Letter: B
Question
BOROUGH OF CoMMUNITY COLLEGE DEPARTMENT OF SCIENCE Phy 210 Name: Spring 2017 Quiz M4. 1. A hydraulic jack is used to lift a load of weight 4000 N. The load-bearing cylinder has a radius of 4 cm, and the other piston has a radius of 1 cm. What force must be exerted on the smaller piston to support the load? (a) 100 N, (b) 250 N. (c) 1000 N (d) 4000 N. (e) 16,000 2. One section of pipe carrying water has a cross-sectional area of 16 cm in this section the water has flow velocity of 1.0 Another section of this pipe has constricted cross-sectional area of 4 cm lf the flow is steady, what water velocity in the constricted is the 0.50 m/s, (e) 0.25 m/s. section? (a) 4.0 m/s, (b) 2.0 mis, (c) 1.0 m/s, (d) 3. Why is a power line more likely to break in winter than in summer, even if it is loaded with the same weight, 4. The density of ice is about 900 kg/m3, and the density of water is about 1000 kglm3. A cubic block of ice one meter on a side floats in water. Assuming that the lowest square face of the cube is horizontal, the height of the block above the water line is (a) 0.9 m. (b) 0.8 m, (c) 0.5 m, (d) 0.2 m, (e) 0.1 m. 5. A long steel beam has a length of twenty-five meters on a cold day when the temperature is 00C. What is the length of the beam on a hot day when T 40C? (asteel 1.1 x 10-5/C°) 25.044 m (a) 25.000 44 m, (b). 25.0044 m, (c) 25.011 m, (d) 6. In a large tank of liquid, the hydrostatic pressure at a given depth is a function of (a) depth, (b) surface area, (c) liquid density, (d) Choices a and c are both valid.Explanation / Answer
5.
dL = L0*alpha*dT
dT = 40 - 0 = 40 C
L0 = 25 m
alpha = 1.1*10^-5 /C
dL = L - L0
So,
L = L0 + alpha*L0*dT
L = 25*(1 + 1.1*10^-5*40) = 25.011 m
Correct option is C.
6.
Pressure is given by:
P = Patm + rho*g*H
So it dependes on depth and liquid density
Correct option is D.
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