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A 21 loudspeaker is suspended 3.0 below the ceiling by two cables that are each 40 from vertical. What is the tension in the cables in newtons?
A man walks along a straight path at a speed of 4 ft/s. At what rate is the searchlight rotating when the man is 15 ft from the point on the path closest to the searchlight?
A soccer player kicks a rock horizontally off a cliff 38.5 m high into a pool of water. If the player hears the sound of the splash 3.20 s later, what was the initial speed given to the rock? Assume
An object weighing 307 N in air is immersed in water after being tied to a string connected to a balance. The scale now reads 270 N. Immersed in oil, the object weighs 282 N. Calculate the density
Suppose the current suddenly increases to 1.74 A in the same direction as before, due to an increase in speed of the bar.
What is the length of each side as measured by this observer? Assume that the side that the block is moving parallel to is L1.L1 = mL2 = mL3 = m
At a distance of 3.7 m from a siren, the sound intensity is 3.50 10-2 W/m2. Assuming that the siren radiates sound uniformly in all directions, find the total power radiated.
What is the maximum speed with which a 1200-{rm kg} car can round a turn of radius 75.0 {rm m} on a flat road if the coefficient of friction between tires and road is 0.70?
The passengers in a roller coaster car feel 54% heavier than their true weight as the car goes through a dip with a 34 radius of curvature.What is the car's speed at the bottom of the dip?
How many cubic meters of gas must be burned each day to maintain an inside temperature of 23.0°C if the outside temperature is 0.0°C? Disregard radiation and energy loss by heat through the
The first person is initially moving forward with a speed of 2.50 m/s, and the second person is initially at rest. What are the velocities of the two people after the snowball is exchanged? Disregar
if you exert a horizontal force of 200 N to slide a desk across an office floor at a constant velocity, how much friction does the floor exert on the desk? Is the force of friction equal and opposit
After the explosion one of the masses has a velocity of 3.0 m/s at an angle of 60° north of east. What is the magnitude of the velocity of the other mass after the explosion?
Suppose we have an infinitely long wire carrying a current of 4.0 A. It is bent into an L-shape extending into positive infinities along the x- and y- axes. Find the magnitude of the magnetic field
An 80kg runner accelerates out of the starting blocks at 2.0m/s squared. He reaches his top speed in 10 seconds. What force must the runner exert that he can achieve his acceleration?
A chair of mass 10.0 is sitting on the horizontal floor; the floor is not frictionless. You push on the chair with a force = 38.0 that is directed at an angle of 39.0 below the horizontal and the c
A long-distance power line that has a resistance of 90. What percentage of the power delivered by the generator is dissipated as heat in the power line?
Three equal point charges, each with charge 1.10 microcoulombs , are placed at the vertices of an equilateral triangle whose sides are of length 0.300 . What is the electric potential energy of the
At what position should a 75.0 gram mass be suspended to put the system in equilibrium?(b.)what mass would have to be at the 90.0 cm position for the system of the equilibrium?
Birds resting on high-voltage power lines are a common sight. A certain copper power line carries a current of 130 A. What is the potential difference across the bird's feet?
A rock is suspended from a string and moves downward at constant speed. Which statement is true concerning the tension in the string if air resistance is ignored?
A roller coaster is towed up an incline at a steady speed of 0.50 m/s by a chain parallel to the surface of the incline. The slope is 3.0 %, which means that the elevation increases by 3.0 m for ev
Three ropes are attached to a small ring. Two of the ropes are attached to walls at right angles with tensions of 80 N north wall, 50 N west wall. What are the magnitude and direction of the tension
The cross section of its muscle would increase by 1 0002 and the length of contraction would increase by 1 000. How high would this "superflea" be able to jump?
If the coefficient of kinetic friction between block and floor was 0.19, what were (a) the work done by the worker's force and (b) the increase in thermal energy of the block-floor system?