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A person exerts a force of 28N on the end of a door 84cm wide. What is the magnitude of the torque if the force is exerted...
a) Perpendicular to the door?
b) At a 60degree angle to the face of the door?
Please keep lengths in metric system.
a student standing on a stationary skateboard tosses a textbook with a mass of mb 1.55 kg to a friend standing in
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A sample of ore containing radioactive strontium9038Sr has an activity of 7.6 x 105 Bq. How many grams of strontiumare in the sample
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A23.0-mW laser beam of diameter1.85mm is reflected at normal incidence by a perfectly reflecting mirror. Calculate the radiation pressure on the mirror
A 82-kg fisherman in a 114-kg boat throws a package of mass m = 15 kg horizontally toward the right with a speed of vi = 4.6 m/s, find the velocity of the boat after the package is thrown
Susan's 10.0kg baby brother Paul sits on a mat. Susan pulls the mat across the floor using a rope that is angled 30° above the floor. The tension is a constant 32.0N and the coefficient of friction is 0.170. Use work and energy to find Paul's s..
q.water flows over a dam at the rate of 670 and falls vertically 78 before striking the turbine blades.estimate the
A radioactive isotope has an activity of 8.09 mCi. After 3.05 hours the activity is 6.31 mCi. What is the half-life of the isotope?
The lower boundary of the plate is defined by: y = 0.650 x2. The plate has a mass of 3.70 kg. Find the moment of inertia of the plate about the y-axis
For an atom (mythical), there are three possible energy levels between which an electron can jump
A 3 kg block slides with a speed of 1.1 m/s on a frictionless horizontal surface until it encounters a spring. What initial speed should the block have to compress the spring by 1.2 cm
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