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A 18 loudspeaker is suspended 3.0 below the ceiling by two cables that are each 40 from vertical. What is the tension in the cables?
A football is kicked with an initial speed of 17 m/s at an angle of 40 degrees above the horizontal. What is the maximum height that it reaches?
A paperweight, when weighed in air, has a weight of W = 6.6 N. When completely immersed in water, however, it has a weight of Win water = 4.0 N. Find the volume of the paperweight.
At the same time a cannon-ball is dropped straight down and strikes the ground in 2 seconds. How far from the castle wall does the first cannon-ball land?
75-W lightbulb is designed to operate with an applied ac voltage of 120 V rms. The bulb is placed in series with an inductor L, and this series combination is then connected to a 60-Hz 240-V r
At what angle of incidence should one of them shine a flashlight beam on the mirror so that the reflected beam directly strikes the other person?
A uniform disk turns at 1.6 around a frictionless spindle. A nonrotating rod, of the same mass as the disk and length equal to the disk's diameter, is dropped onto the freely spinning disk . They t
What are the (a) voltage decrease ?V along the transmission line and the (b) rate Pd at which the energy is dissipated in the line as thermal energy? If Vt = 8.0kV.
The turntable is rotating in the opposite direction with an angular velocity of magnitude omega relative to the earth. The radius of the turntable is r, and its moment of inertia about the axis of r
A car is traveling 26 m/s when the driver sees a child standing on the road. He takes 0.8 s to react, then steps on the brakes and slows at 7.0 m/s2. How far does the car go before it stops?
An athlete at the gym holds a 1.5 steel ball in his hand. His arm is 70 long and has a mass of 4.0 .What is the magnitude of the torque about his shoulder if he holds his arm straight out to his si
A disk of radius R = 11 cm is pulled along a frictionless surface with a force of F = 20 N by a string wrapped around the edge. At the instant when d = 26 cm of string has unwound off the disk, wha
Jupiter emits radio waves and also visible light (reflected Sunlight). Which of the following statements about the light we detect from Jupiter is true?
How far below ground level does the bottom of the pool appear to be located when a) the pool is completely filled with water and b) the pool is filled halfway with water?
A hydraulic chamber with a spring (spring constant = 1600 N/m) attached to the input piston and a rock of mass 40.0 kg resting on the output plunger. the piston and plunger are nearly at the same h
A cube of ice is taken from the freezer at -8.5 C and placed in a 96 g aluminum calorimeter filled with 314 g of water at room temperature of 20 C. The final situation is observed to be all water a
Suppose a child of weight w climbs onto the sled. If the tension force is measured to be 58.5 N, find the weight of the child and the magnitude of the normal force acting on the sled
Find the Semi-major axis of the ellipse. Treat the orbits of Earth and Mars as circles.) Calculate how long (in days) such a one-way trip to Mars would take.
A hand-pumped water gun is held level at a height of 0.66 m above the ground and fired. The water stream from the gun hits the ground a horizontal distance of 6.6 m from the muzzle. Find the gauge p
An object at rest on a flat, horizontal surface explodes into two fragments, one five times as massive as the other one. The lighter fragment gains a velocity of 10 m/s in the left direction right
you carry a bag of groceries weighing 124 N from your car to your kitchen, a distance of 68 m, without raising or lowering the bag. What is the work done by the force you exert on the bag?
A hydrogen atom, in which the electron orbits the proton at an average distance of 5.09 10-11 m. What is EPEfinal - EPEinitial, which is the change in the electric potential energy?
Find the constant force that must be exerted on him to bring him to rest in a distance of 1.4 m in a time interval of 0.20 s.
How far must you walk toward speaker to move to reach the first point of destructive interference? Take the speed of sound to be 344 .
A 20 000 N truck is acted upon by a force that decreases its speed from 10 m/s to 5.0 m/s in 5.0 sec. What is the magnitude of the force?