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An astronaut flies from the Earth to a distant star at 60% of the speed of light. As measured by the astronaut, the one-way trip takes 18 years.
a) How long does the trip take as measured by an observer on the Earth?
b) What is the distance from the Earth to the star (in light-years) as measured by an Earth observer?
c) What is the distance from the Earth to the star (in light-years) as measured by the astronaut?
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You are playing basketball and go to toss the ball to a teammate who is 10 meter away. Obtain how fast must you throw the ball
Light has a wavelength of 299.3 nm and a frequency of 7.403 × 1014 Hz when traveling through a certain substance. What is the refraction index of this medium
A baseball is thrown with an initial velocity of 41.4m/s at an angle of 31.2 degree. Find the maximum height that the ball reaches using energy considerations
A 2.10-kg ball, moving to the right at a velocity of +4.60 m/s on a frictionless table, collides head-on with a stationary 6.30-kg ball. Find the final velocities of (a) the 2.10-kg ball and of (b) the 6.30-kg ball if the collision is elastic. (c)..
One gram of water changes from liquid to solid at a constantpressure of 1.00 atm and a constant temperature of 0°C. Find the change in the internal energy of the water
A spaceship is 1600 m long when it is at rest. When it is traveling at a certain constant speed its length is measured by external observers and it is found to be 1165 m. What is the speed of the spaceship in terms of the speed of light?
A roller coaster has 8 cars, each of mass of 95.0 kg. The ride begins 47.5 m above the ground. What is the speed of the train
If a system in equilibrium with two masses m1 and m2 are placed at distances d1 and d2 from the fulcrum, then f1 d1= f2 d2. Is this the same as saying that m1 d1= m2 d2? Give details.
Archaeologists have unearthed a primitive stringed instrument at the ancient Sumerian city of Lude Compute the fundamental frequency of this instrument
A fire engine moving to the right at 40 m/s sound its horn (frequency = 500 Hz) at the two vehicles shown in the figure. The car is moving to the right at 30 m/s, while the van is at rest. (a) What frequency is heard by the passenger in the car?
A major environmental push is for "energy conservation" in the house, work place etc. How does this conception differ from the pure physicists' conception of energy conservation?
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