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Light is emitted from an ordinary lightbulb filament inwave-train bursts about 10^-8s in duration. What is the length in space of such wave trains?
A 0.25 kg stone attached to a 0.8 m long string is rotated in a horizontal plane. The string makes an angle of 17° with the horizontal. Determine the speed of the stone
When doing a sound experiment, you recorded the sound of a single frequency sound source when it was stationary. what was the frequency of the source
assume that the tale applies a constant force of friction of 0.5 N block. if the block compresses the spring by 3cm after hitting it, what was the speed of the ball(hit spring)
In compressing the spring in a toy dart gun, 0.4 J of work is done. What is the dart's kinetic energy as it leaves the gun
A hypodermic syringe is attached to a needle that has an internal radius of 0.301 mm and a length of 3.01 cm. What force must be applied to the plunger
A child suddenly runs into the street. If it takes the driver 0.80 s to react and apply the brakes, explain how many meters will the car have moved before it begins to slow down?
Capacitors C1 = 5.65 µF and C2 = 2.75 µF are charged as a parallel combination across a 250 V battery. Calculate the resulting charge on each capacitor
A 1000 car pushes a 2000 truck that has a dead battery. What is the magnitude of the force of the truck on the car
A pulley wheel that is 22.0 cm indiameter has a 5.2 m long cord wrappedaround its periphery. How long does the unwinding take
Three particles, each with a mass of 0.25 kg, are located at (- 4.0 m, 0), (2.0 m, 0), and (0, 3.0 m) and are acted on by forces, and respectively.
A 3-m-long rigid beam with a mass 120 {rm kg} is supported at each end. An 70 {rm kg} student stands 2.0 {rm m} from support 1. How much upward force does support 1 exert on the beam.
The National Museum of Photography, Film & Television, in England, has a huge converging lens with a diameter of 1.37 m and a focal length of 8.45 m. What is the image magnification
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