How much tension must a cable withstand if it is used to accelerate a 1200-kg car vertically upward at 0.70m/s2?
What will be an ideal response?
Ans
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Which of these statements is true for the image formed by spherical mirror?
A. real images of real objects are always inverted B. virtual images of real objects are always in front of the mirror C. virtual images of real objects are always upright D. real images are always in back of the mirror
Shear Modulus: A shear force of 400 N is applied to one face of an aluminum cube having sides of 30 cm each. What is the resulting displacement of this face of the cube if the opposite face is held fixed? The shear modulus for aluminum is 2.5 × 1010 N/m2.
A. 1.9 × 10-8 m B. 4.4 × 10-8 m C. 5.3 × 10-8 m D. 8.2 × 10-8 m
A 1.9-m2 Thermopane window is constructed by using two layers of glass 4.0 mm thick, separated by an air space of 5.0 mm. If the temperature difference is 25.0 °C from the inside of the house to the outside air, what is the rate of heat flow through this window? (Thermal conductivity for glass is 0.840 J/s/m/°C and for air 0.023 4 J/s/m/°C.)
a. 2 530 W b. 426 W c. 3 190 W d. 210 W e. 2 100
What will the temperature of the cosmic microwave background be when the average distances between galaxies are twice as large as they are today?
A. 1.365 B. 4.860 C. 5.250 D. 3.375