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Two identical boxcars (m = 15730 kg) are traveling along the same track but in opposite directions. Both boxcars have a speed of 4 m/s. If the cars collide and couple together, what will be the final speed of the pair?
You want to examine the hairy details of your favorite pet caterpillar, using a lens of focal length 8.9 cm that you just happen to have around. what angular magnification do you achieve
1.) A 0.50kg bullfrog is sitting at rest on a level log. How large is the normal force of the log on the bullfrog. 2.) A second 0.50kg bullfrog is on a log tilted 38 above horizontal. How large is the normal force of the log on this bullfrog
A wave on a string is described by the equation y = (4.2 mm)cos(3000t 0.45x) where t is measured in s and x is measured in mm
A bottle containing 3.4 kg (mass) of water at a temperature of 23.4 oC is placed in a refrigerator where the temperature is kept at 3.2 oC
A cell phone battery uses chemistry to create a charge separation between the terminals (anode and cathode). How many free electrons does the battery contain
A bicycle racer is going downhill at 12.2m/s when, to his horror, one of his 2.42kg wheels comes off when he is 75.0m above the foot of the hill. How much total kinetic energy does the wheel have when it reaches the bottom of the hill
a force of 60 N causes an object to have an acceleration equal to 4 m/s2. What is the object's mass
On a workday the average decibel level of a busy street is 72.0 dB, with 100 cars passing a given point every minute. If the number of cars is reduced to 50 every minute on a weekend, what is the decibel level of street.
If a car travelling at 30m/s will skid 18.00 m when its brakes lock and the car slides, how far would it skid if it is travelling at 40 m/s when its brakes lock? (This question is typical on some driver's license exams. Note: 10 m/s = 22 mph)
A shop sign weighing 245-N is supported by a uniform 155-N bean. Find out the tension in the guy wire, and the horizontal and vertical forces exerted by the hinge on the bean.
A 2.03 kg book is placed on a flat desk. Suppose the coefficient of static friction between the book and the desk is 0.502, How much force is needed to keep the book moving at constant speed once it begins moving
A 2.93 kg stone is tied to a thin, light wire wrapped around the outer edge of the uniform 9.83 kg cylindrical pulley, What is the rotational inertia of the pulley
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