Specific Heat: At room temperature, a typical person loses energy to the surroundings at the rate of 62 W. If this energy loss has to be made up by an equivalent food intake, how many kilocalories (food calories) does this person need to consume every day just to make up this heat loss? (1 cal = 4.186 J)
A. 1000 kcal
B. 1100 kcal
C. 1300 kcal
D. 1500 kcal
E. 1600 kcal
Answer: C
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Weight and g: Planet A has twice the mass of Planet B. From this information, what can we conclude about the acceleration due to gravity at the surface of Planet A compared to that at the surface of Planet B?
A. The acceleration due to gravity on Planet A must be twice as great as the acceleration due to gravity on Planet B. B. The acceleration due to gravity on Planet A must be four times as great as the acceleration due to gravity on Planet B. C. The acceleration due to gravity on Planet A is the same as the acceleration due to gravity on Planet B. D. The acceleration due to gravity on Planet A is greater than the acceleration due to gravity on Planet B, but we cannot say how much greater. E. We cannot conclude anything about the acceleration due to gravity on Planet A without knowing the radii of the two planets.
Shear Modulus: The base of a metal block, which is fixed in place, measures 90 cm by 90 cm, and the height of the block is 60 cm. A force, applied to the upper face and parallel to it, produces a shear strain of 0.0060. The shear modulus of this metal is 3.0 × 1010 Pa. The shear stress on the block in megapascals is closest to
A. 180 MPa. B. 360 MPa. C. 600 MPa. D. 720 MPa. E. 900 MPa.
The energy of a photon depends on its
A) speed. B) frequency. C) amplitude. D) all of the above E) none of the above
A farsighted boy has a near point at 2.3 m and requires contact lenses to correct his vision to the normal near point. What is the correct choice of lens power for the contact lenses?
A) -0.28 diopters B) +0.28 diopters C) -3.6 diopters D) +3.6 diopters E) +1.8 diopters