When water freezes, the entropy of the water
A. increases.
B. decreases.
C. does not change.
D. depending on other factors could increase or decrease
B. decreases.
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Simple Pendulum: An astronaut has landed on Planet N-40 and conducts an experiment to determine the acceleration due to gravity on that planet. She uses a simple pendulum that is 0.640 m long and measures that 10 complete oscillations 26.0 s. What is the acceleration of gravity on Planet N-40?
A. 4.85 m/s2 B. 1.66 m/s2 C. 3.74 m/s2 D. 2.39 m/s2 E. 9.81 m/s2
A 4.0-cm tall object is placed 60 cm away from a converging lens of focal length 30 cm. What are the nature and location of the image? The image is
A) real, 2.5 cm tall, and 30 cm from the lens on the same side as the object. B) virtual, 4.0 cm tall, and 60 cm from the lens on the same side as the object. C) virtual, 2.0 cm tall, and 15 cm from the lens on the side opposite the object. D) virtual, 2.5 cm tall, and 30 cm from the lens on the side opposite the object. E) real, 4.0 cm tall, and 60 cm from the lens on the side opposite the object.
A mass src="https://sciemce.com/media/4/edf57f6e1d0acd4635.png" class="w-image" />?
is connected by a light string that passes over a pulley of mass M to a mass 
as shown in the figure. Both masses move vertically and there is no slippage between the string and the pulley. The pulley has a radius of 30.0 cm and a moment of inertia of 
If 
is 4.00 kg, 
is 3.00 kg and M is 6.00 kg, then what is the tension in the string that is attached to
A. 20.7 N
B. 25.5 N
C. 31.7 N
D. 35.2 N
E. 41.3 N
A wooden block A of mass 4.0 kg slides on a frictionless table when pulled using a massless string and pulley array by a hanging box B of mass 5.0 kg, as shown in the figure
What is the acceleration of block A as it slides on the frictionless table? Hint: Think carefully about the acceleration constraint. A) 4.1 m/s2 B) 3.5 m/s2 C) 3.1 m/s2 D) 2.7 m/s2