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Q1. a car with a mass 1865 kg is travelling west and slows down uniformly to 8.5 m/s over a distance of 108 m. calculate the initial speed of the car if the required braking force is 7525 N
Q2. During its evolution, a star of 1 solar mass (the mass of our Sun) expands to 3.33 times its original radius.
suppose that, during this expansion:
- star has no appreciable loss of mass- mass is uniformly distributed through the volume- star remains spherical during the entire process
a) If the star was initially spinning with a period of To = 36.9 days: find Tf, the period of rotation of the star after the expansion 1 days
b) compute the ratio R., where
R = (final kinetic energy of the star)/(initial kinetic energy of the star)
Two stars located 22 light-years from Earth are barely resolved using a reflecting telescope having a mirror of diameter 66 cm. find the separation between the stars
A jet airplane is in level flight. The mass of the airplane is m = 8830 kg. calculate At what angle is the airplane banked
A 12-kg box is free from the top of an incline that is 5.00m long and makes an angle of 40 degrees to the horizontal. A 60-N friction force impedes the motion of the box.
A car is coasting along at 20 m/s on a road along the top of a hill that is 100 meters high. how fast is it going when it reaches the bottom
A charged particle (m = 8.05 g, q = - 7.68 µC) localized at point A has a speed of 0.88 m/s. What is the kinetic energy of the particle when reach B
What is magnitude of the runner total displacement
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Some of the earliest atomic models held that the orbital velocity of an electron in an atom could be correlated with the radius of the atom, what is the kinetic energy of this orbital electron
A woman has a mass of 59 kg, What is her weight on earth and What are her mass and her weight on the moon
A sinusoidal voltage ?v = (75 V) sin (140t) is applied to a series RLC circuit with L = 20 mH, C = 100 ?F, and R = 46 ?. What is the impedance of the circuit
When a hammer strikes a nail, it is compressed along its length. What average force was exerted on the nail by the hammer
An electric car is being designed to have an average power output of 4,900 W for 2 h before needing to be recharged, How much energy would be stored in the charged batteries
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