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A large flat disk lies in a horizontal plane, free to rotate about a vertical pivot at its center. A string is attached to the disk 40cm east and 30cm north of the pivot, and pulled directly south-east with a force of 20N. What is the magnitude and direction of the torque exerted on the disk, about the pivot?
A 4 kg object moving at 17 m/s in the positive x direction has aone-dimensional elastic collision with an object initially at rest. After the collision the object of unknown mass has a velocity of 30 m/s in the positive xdirection. What is the unk..
A 1.80-kg object attached to a spring moves without friction (b = 0) and is driven by an external force given by the expression F = 6.00sin(2?t), Find the resonance angular frequency of the system
A microscope has an objective lens with a focal length of 16.22 mmand an eyepiece with a focal length of 9.00 mm. what is the actual diameter of the red blood cell
A person with perfect pitch sits on a bus bench listening to the 451 Hz horn of an approaching car. If the person detects a frequency of 486 Hz, how fast is the car moving
What is the reading on each of the scales? On the left scale. Express your answer using two significant figures. Part A What is the reading on each of the scales? On the left scale.
can two monochromatic sources of significant frequency difference produce an observable interference pattern?in a
A carbon steel piano wire 1.4 m long with a cross-sectional area of 2 × 10?6 m2 and mass 0.1 kg is stretched 23 mm. Determine the speed of transverse waves on the string. For carbon steel, Young’s modulus is 2 × 1011 N/m2.
A piece of iron is heated to 900?C. What is the median wavelength of its blackbody radiation
A student wants to find out the speed of a high-speed projectile, but doesn't have a high-speed measuring device. what is the speed of the projectile just before the collision
A ball of mass 1.7 kg hangs at the end of a string 1.2 m in length from the ceiling of a room. The height of the room is 4.0 m. What is the gravitational potential energy of the ball relative to the ceiling
Assuming no heat loss to the surrounding environment, determine the minimum duration of time necessary for a 100 W aquarium tank heater to raise the temperature of 20.0 gallons of water by a difference of 10.0°C.
The total current delivered to a number of devices connected in parallel is the sum of the individual currents in each device. Obtain the total current delivered by the source
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