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A 4.0 m diameter merry-go-round is initially turning with a 4.4 s period. What is the speed of a child on the rim?
A football coach sits on a sled while two of his players build their strength by dragging the sled across the field with ropes. The friction force on the sled is 900 N and the angle between the two
A 2.6 kg wood block is launched up a wooden ramp that is inclined at a 32° angle. The block's initial speed is 10 m/s. (Use µk = 0.20 for the coefficient of kinetic friction for wood on w
On this surface the cars race in circles that are parallel to the ground, and the surface is at an angle = 20°. For a speed of 25 m/s, at what value of the distance d should a driver locate his
At an accident scene on a level road, investigators measure a 2000kg car's skid mark to be 88 m long. The coefficient of friction was estimated to be .42. Use these date to determine the speed when
The charges have different masses, but the same speed v. In the magnetic field, they move in semicircles with radii R and 2R, respectively. (a) What is the ratio of their masses?
Having trouble understanding this lab question. we did a lab on acceleration due to gravity and we did 3 parts one part was dropping balls and timing its fall, another one was picketfence and the ot
A 2100 cm3 container holds 0.11 mol of helium gas at 350 degrees C. How much work must be done to compress the gas to 1100 cm3 at constant pressure? And how much work must be done to compress the gas
Two skaters,a man and a woman, are standing on ice. Neglect any friction between the skate blades and the ice. The woman pushes on the man with a certain force that is parallel to the ground.
Will the rod still fit inside the washer? If so, how much smaller is the rod than the opening in the washer? If not, how much larger is the rod than the opening in the washer?
A 1600 kg car is moving westward with a speed of 20 m/s, and a 2800 kg truck is traveling east with a speed of 18 m/s. Find the velocity of the center of mass of the system. (Take east to be the pos
Three point masses of 1.9 kg each are located on the x axis. One is at the origin, another at x = 0.18 m, and another at x = 0.49 m. Find the center of mass of the system.
An electrical outlet for an electric stove provides a potential difference of 240 V, rms. Find the amplitude of the potential difference.
A diffraction grating that has 1000 slits / cm is parallel to the y-axis. The center is located on the x-axis at x = -5 m. A source of light of wavelength 650 nm is on the x-axis @ x = -125 m. How m
A vase with a mass of 0.800 kilograms falls from a height of 0.750 meters to a position of 0.500 meters above the floor. Ignoring frictional effects, the total mechanical energy at the 0.500 positio
An electron moving with a speed of 6.1x10^5 m/s in the positive x direction experiences zero magnetic force. When it moves in the positive y direction, it experiences a force of 1.9 x 10^-13 N that
Cloverleaf exits are approximately circular. A 1712 kg automobile is traveling 70 mph while taking a cloverleaf exit that has a radius of 46.4 m. Calculate the centripetal acceleration of the car an
An 80-cm-long, 1.0-mm-diameter steel guitar string must be tightened to a tension of 2000 N by turning the tuning screws. By how much is the string stretched?
The 21.0- child accelerates too, but with a smaller acceleration than that of the sled. Thus, the child moves forward relative to the ice, but slides backward relative to the sled. Find the accelera
A car alternator consists of a 220-turn coil 12 cm in diameter in a magnetic field of 0.10 T. If the alternator is turning at 1100 rpm, what is its peak output voltage?
When he accelerates from a stoplight, the tassel deflects backward toward the rear of the car at an angle of 5.87 degrees relative to the vertical. a) Find the tension in the string holding the tass
A 9.0 resistor and a 6.0 resistor are connected in series with a power supply , the voltage drop across the 6.0 resistor is measured to be 12 V. what is the voltage output of a power supply?
To move a large crate across a rough floor, you push on it with a force F at an angle of 21 degrees below the horizontal, Find the force necessary to start the crate moving, given that the mass of t
Assume that the axis is located where the branch joins the tree trunk and is perpendicular to the plane formed by the branch and the trunk.
A 6.0-kg block is released from rest 80 m above the ground. When it has fallen 60 m its kinetic energy is approximately: