A two-dimensional object placed in the xy-plane has three forces acting on it: a force of 3.0 N along the x-axis acting at a point (3 m, 4 m);
A force of 2.0 N along the y-axis acting at (-2 m, 5 m); and a force of 5 N in the negative x direction acting at (-2 m, -3 m). What is the net torque about the point (-1 m, 1 m)?
A)
7 N m counterclockwise
B)
23 N m clockwise
C)
3 N m counterclockwise
D)
31 N m clockwise
E)
7 N m clockwise
D
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An 8000-kg aluminum flagpole 100-m high is heated by the Sun from a temperature of 10°C to 20°C. Find the increase in internal energy (in J) of the aluminum. (The coefficient of linear expansion is 24 × 10?6 (°C)?1, the density is 2.7 × 103 kg/m3, and the specific heat of aluminum is 0.215 cal/g?°C.)
A. 7.2 × 105 B. 7.2 × 107 C. 7.2 × 103 D. 7.2 × 101 E. 7.2 × 102
The focal lengths of the objective and the eyepiece in a microscope are 0.290 cm and 2.50 cm, respectively
An object is placed 0.300 cm from the objective. The image of this object is viewed with the eyepiece adjusted for minimum eyestrain (image at the far point of the eye) for a person with normal vision. What is the distance between the objective and the eyepiece? A) 11.2 cm B) 11.5 cm C) 9.85 cm D) 10.4 cm E) 10.1 cm
Newton's 2nd Law of Motion states that
A) action and reaction are equal and opposite B) force equals mass times acceleration C) an object moves at a constant velocity unless a force acts D) the force of gravity decreases with increasing distance
The graph shows the force on an object as it moves a distance x. What is the work done by the force when the object moves from 0.0 m to 6.0 m?
A. 14 J
B. 12 J
C. 10 J
D. 8.0 J
E. 6.0 J