A 20-kg piece of aluminum (which has a specific heat of 900 J/kg • °C) is warmed so that its temperature increases by 5.0°C. How much heat was transferred into it?
a. 4.5 × 10^4 J
c. 1.4 × 10^5 J
b. 9.0 × 10^4 J
d. 2.0 × 10^5 J
B
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A wheel rotating about a fixed axis with a constant angular acceleration of 2.0 rad/s2 starts from rest at t = 0. The wheel has a diameter of 20 cm. What is the magnitude of the total linear acceleration of a point on the outer edge of the wheel at t = 0.60 s?
A. 0.25 m/s2 B. 0.50 m/s2 C. 0.14 m/s2 D. 0.34 m/s2 E. 0.20 m/s2
The long, heavy tail of a spider monkey enables the monkey to easily vary its
A) weight. B) momentum. C) inertia. D) center of gravity. E) none of the above
A thermodynamic engine has an efficiency of 31.4% and receives 8.72 kJ of energy per cycle. (a) How much work does it perform in each cycle? (b) How much energy does it exhaust in each cycle?
What will be an ideal response?
The focal lengths of the objective and the eyepiece of a microscope are 0.5 cm and 2.0 cm, respectively, and their separation adjusted for minimum eyestrain is 6.0 cm. The near-point distance of the person using the microscope is 25.0 cm
If the microscope is focused on a small object, what is its final magnification? A) -44 B) -66 C) -77 D) -88 E) -100