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A spacecraft moving away from Earth emits a 4480 Hz signal. A scientist on Earth measures the signal to be 4476 Hz. What is the speed of the spacecraft relative to Earth?
The resolution of the eye is ultimately limited by the pupil diameter. What is the smallest diameter spot the eye can produce on the retina
A 1600 kg car traveling eastward at 32 m/s collides at an intersection with a 700 kg motorcycle traveling northward at 45 m/s. What is the direction of the car's velocity after the collision
What is the maximum speed of the disk without the block and penny sliding? The accelertion of gravity is 9.8m/s2 (meters persecond squared). Answer in units of rpm.
A 120 cm length of string has a mass of 2.50 g. It is stretched with a tension of 7.00 N between fixed supports. what is the lowest resonant frequency of this string
A moving body undergoes uniform acceleration while travelling in a straight line between points X, Y and Z. The distances XY and YZ are both 40m. The time to travel from X to Y is 12s and from Y to Z is 6s.
A student places an object on the 5.0 cm mark of the meter stick. He places a positive lens that he knows has a focal length of 15.0 cm at the 30.0 cm mark on the meter stick. From the data what is the focal length of the negative lens
The work done by an engine equals one-half the energy it expels to a cooler at 0C. what is the temperature of the heater
A 52% efficient device uses chemical energy to generate 570J J of electric energy. How much chemical energy is used
Point charges of -8.20 micro Coulombs are placed at each corner of a square that is 0.250m on a side. Find the electric potential at the center of a square
a long solenoid has 100 turnscm and carries current i. an electron moves within the solenoid in a circle of radius 2.28
q1. the bottom of a box has a surface area of 2.50 m2. the mass of the box is 51.5 kg. acceleration because of gravity
A well-insulated electric water heater warms119kg of water from 20.0° C to47.0° C in33.0min. Find the resistance of its heating element
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