A projectile is launched from the surface of a planet (mass = m, radius = r). What minimum launch speed is required if the projectile is to rise to a height of 2r above the surface of the planet? Disregard any dissipative effects of the atmosphere.
A.
B.
C.
D.
E.
Answer: A
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A fire hose is turned on the door of a burning building in order to knock the door down. This requires a force of 1000. N
If the hose delivers 40. liters per second, what is the maximum velocity of the stream needed, assuming the water doesn't bounce back? A) 50. m/s B) 25 m/s C) 40. m/s D) 15. m/s E) 30. m/s
What was wrong with the hubble that it needed maintenance?
What will be an ideal response?
In a two-dimensional Cartesian system, the x-component of a vector is known, and the angle between vector and x-axis is known. Which operation is used to calculate the magnitude of the vector? (taken with respect to the x-component)
a. dividing by cosine b. dividing by sine c. multiplying by cosine d. multiplying by sine
Sometimes an experiment requires a certain pure gas to be used at reduced pressure. One way to achieve this is to purchase a sealed glass container filled with the gas,
and to introduce the gas into a vacuum by attaching the glass container to the vacuum chamber and breaking the tip of the glass container using a metallic bean and a magnet. If the volume of the glass container is 1.0 L and it is at a pressure of 1.0 × 105 Pa and if the vacuum chamber has a volume of 2.0 L, what will the pressure be after the gas, which is to be assumed to be an ideal gas, is released into the vacuum chamber and the temperature has returned to its original value? (Note that the glass container remains part of the system.) A) 33 kPa B) 50 kPa C) 200 kPa D) 300 kPa