Increased air pressure on the surface of hot water tends to
A) prevent boiling.
B) promote boiling.
C) neither of these
Answer: A
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Flux: A rectangular loop of wire that can rotate about an axis through its center is placed between the poles of a magnet in a magnetic field with a strength of 0.40 T, as shown in the figure. The length of the loop L is 0.16 m and its width w is 0.040 m. What is the magnetic flux through the loop when the plane of the loop makes an angle of 60° with the magnetic field?
A. 2.6 × 10-3 T ? m2 B. 1.3 × 10-3 T ? m2 C. 0 T ? m2 D. 2.2 × 10-3 T ? m2 E. 0.80 T ? m2
A large massive rock is in contact with the earth. Draw a force diagram for the rock and the earth. Which of the following statements is true?
A. The gravitational force on the rock due to the earth and the gravitational force on the earth due to the rock are interaction partners. B. The gravitational force on the rock due to the earth and the contact force on the earth due to the rock are interaction partners. C. The contact force on the earth due to the rock and the gravitational force on the earth due to the rock are interaction partners. D. The gravitational force on the earth due to the rock and the contact force on the earth due to the rock are interaction partners.
To determine the location of the center of mass of a car, the car is driven over a scale on a horizontal floor
When the front wheels are over the scale, the weight recorded by the scale is 5800 N, and when the rear wheels are over the scale, the scale reads 6500 N. The distance between the front and rear wheels is measured to be 3.20 m. How far behind the front wheels is the center of mass located? A) 0.845 m B) 1.50 m C) 1.59 m D) 1.69 m E) 1.72 m
When we add a displacement vector to another displacement vector, the result is:
a. a velocity. c. another displacement. b. an acceleration. d. a scalar.