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Q. A 15m uniform ladder weighing 500 N rests against a frictionless wall. The ladder makes 60 angles with the horizontal.
1) find the horizontal and vertical forces that ground exert on the base of the ladder when an 800N firefighter is 4.00m from the bottom
2) if the ladder is just on the verge of slipping when the firefighter is 9.00m up, what coefficient of static friction between the ladder and the ground.
Problem on the velocity of boat
What is the rate of change entropy of the first reservoir.
What mass (in grams) of steam at 100°C must be mixed with 403 g of ice at its melting point, in a thermally insulated container, to create liquid water at 87°C? The specific heat of water is 4186 J/kg•K. The latent heat of fusion is 333 kJ/kg, and..
A electron is accelerated from rest by the potential difference of 350 V. It then enters a uniform magnetic field of magnitude 200 mT with its velocity perpendicular to the field.
A particular Ferris wheel has a radius of 24 meters, and it makes one complete revolution around its axle (at location A) in 20 seconds. In all of the following questions, consider location A (at the center of the axle) as the location around whic..
A proton is projected perpendicularly into a magnetic field that has a magnitude of 0.30 T. The field is then adjusted so that an electron will follow a circular path of the similar radius when it is projected perpendicularly into the field with t..
A light source, S, is located 2.60m below the surface of a swimming pool and 1.30m from one edge of the pool. The pool is filled to the top with water.
What is the electric field strength a point on the axis 5.0 cm from one disk between them.
A tube of radius 5cm is connected to tube of radius 1 cm as shown above. Water is forced through the tube at a rate of 10 liters/min. The pressure in the 5 cm tube is 1×10^5 Pa. The density of water is 1000kg/m3. Suppose that the water is no visco..
A source emits sound uniformly in all directions. There are no reflections of the sound. At the distance r1 from the source the sound is 3.9 dB louder than it is at a distance r2 from the source. What is the ratio r1/r2.
A 37-kg girl is bouncing on a trampoline. All through a certain interval after she leaves the surface of the trampoline, her kinetic energy decreases to 215 J from 430 J. How high does she rise during this interval? Avoid air resistance.
A total of 34 bright and 34 dark Newton's rings (not counting the dark spot at the center) are observed as 550 -nm light falls normally on a planoconvex lens resting on a flat glass surface. How much broad is the center than the edges.
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