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1) An astronaut travels at a speed of 0.98c from the Earth to a distant star that is 7.3 1017 m away. If the astronaut is 33 years old when she begins her trip, how old is she when she arrives at the star?
2) An astronaut travels away from the Earth at a speed of 0.59c and sends a light signal back to the Earth every 8.0 s as measured by his clock. An observer on the Earth finds that the arrival time between consecutive signals is Δt. Find Δt.
A 2.00 meter long wire loops carrying a current of 2.00 A is in the shape of an equilateral triangle. determine the maximum torque that acts on it
The diagram below shows a mass moving toward the spring with an initial speed of v0. Find the time required for the mass to rest after contacting the spring
A child throws a ball with an initial speed of 8:00m/s at an angle of 40 degrees above the horizontal, what is the magnitude of the ball's velocity just before it hits the ground
When armature is rotated by half revolution, its magnetic polarity changes. Why is it necessary to change the polarity of armature magnet? Explain how does the change take place
A rigid iron cylinder contains propane gas. The cylinder and thegas are in thermal equilibrium. how many moles of propane are there in the cylinder
A rotating water pump works by taking water in at one side of the rotating wheel, and expelling it from the other side. If a pump with a radius of 0.120m starts from rest and accelerates at 30.50 rad/s2.
a ball of mass m 0.20 kg strikes a wall with an initial speed of 5.0 ms and rebounds in the opposite direction with a
Derive a formula for the horizontal range R, of aprojectile when it lands at a height h above its initialpoint. (For h
A man walks 34 degree north of east for 4.10 kilometer. Another man walks due north and due east to arrive at the similar location. Find how large is the east component of this second path
Two 1.60 cm-diameter disks spaced 1.60 mm apart form a parallel-plate capacitor. The electric field between the disks is 5.00×10^5 V/m. How much charge is on each disk
A series RLC circuit has R = 35 ohms, L = 2.7 microhenries, and C = 52 nanofarads. what is the average power dissipated by the circuit
A motorcycle has a constant speed of 27.7 m/s as it passes over the top of a hill whose radius of curvature is 168 m. determine the normal force that acts on the cycle
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