Phys 1415 ch 4
A woman who normally weigh 400N stands on top of a very tall ladder so she is one earth radius above earths surface what is her weigh there
100N
A gun with a muzzle velocity of 100 m/s is fired horizontally from a tower. Neglecting air resistance how far down range will the bullet be 1s later?
100m
Escape speed from earth is
11.2 km/s
Consider amonkey wrench released at rest at the far edge of the solar system. Suppose that it drops to earth by virtue of only earths gravity. The wrench will strike earths surface with a speed of about
11km/s
A projectile is thrown into the air at an angle of 50 degrees and lands on a target that is at the same level the projectile started. With no air resistance it will also land on the target if it's thrown at an angle of
40 degrees
A ball is thrown horizontally from the top of a tall cliff. Three seconds later the ball has fallen a vertical distance of
45m
Without air resistance a ball tossed at an angle of 40 degrees with the horizontal goes as far down range as one tossed at the same speed at an angle of
50 Degrees
What is the force of gravity on a 500N woman standing on earths surface?
500N
A stone is thrown horizontally from the top of a cliff. One second after leaving your hand its drops a vertical distance of
5m
If you tossed a baseball horizontally and with no gravity it would continue in a straight line with gravity it falls about
5m below that line
Throw an object at an angle upward. With no gravity it will follow a straight line path. But because of gravity at the end of 1s it is
5m below the straight line
If your mass remained the same while the mass of earth doubled while staying thensame size your weight would
Double
An object is placed exactly halfway between the earth and the moon . The object will fall toward the
Earth
The force of gravity does work on a satellite when it is in
Elliptical orbit
Consider two planets in space the gravitationally attract each other. If the masses of both planets are doubled, and the distance between them doesn't change then the force between them is
Four times as much
The sun is spherical due to
Gravitation
Two objects move toward each other due to gravity. As the object get closer and closer the force between them
Increase
Compared with the period of satellites in orbit close to earth the period of satellites in orbit far from earth is
Longer
When you toss a projectile sideways it curves as it falls. It will become an earth satellite if the curve it makes
Matches the curve of earths surface
Minimal orbit speed about earth is about 8km/s. Minimal orbital speed about Jupiter would be
More than 8kms
An earth satellite is in an elliptical orbit. The satellite travels fastest when it is
Nearest the earth
The force of gravity between two plants depends on their
None of these
Tangential velocity is velocity
Parallel to the surface of the earth
The period of a satellite the time it takes for a complete revolution depends on the satellites
Radial distance
A projectile is fired vertically from the surface of the earth a 8km/s and remains in a vertical path
Rise and fall back to earth surface
Inhabitants of the international space station do not have a
Support force
A ball is thrown upward and caught when it returns. Neglecting air resistance the time it takes to reach to the top of its path is
The same as its initial speed
Chapter 4 in your textbook cites a link between newtons universal law of gravity an
The u.s. Constitution
Inside a freely falling elevator you would experience no
Weight
A weightless astronaut in an orbiting space vehicle is
Without a support of force
When no air resistance acts on a projectile its horizontal acceleration is
Zero
If the earths mass doubled with no change in radius your weight would
Double
If a projectile is fired straight up at a speed of Q10m/s neglecting air resistance the time it takes to reach the top of its path is
1s
A ball player wishes to determine pitching speed by throwing a ball horizontally from an elevation of 5m above the ground. The player sees the ball land 20m down range. What is the players pitching speed?
20 m/s
Ignoring air drag what is the maximum speed that can be given to a horizontally moving tennis ball as it clears the net 1.25 m high to remain within the edge of the court which is 12.0 m distant?
24 m/s
A bullet fired from a rifle begins to fall
As soon as it leaves the barrel
A satellite in earth orbit is mainly above earths
Atmosphere
The international space station orbits on average 360km altitude so that it is mainly above earths
Atmosphere
The moon fall toward earth in the sense that it falls
Beneath the straight line path it would follow without gravity
A supplier wants to make a profit by buying gold by weight at on altitude and selling it at the same price per kg at another. Altitude. The supplier should
Buy at a high altitude and sell at a low altitude
A satellite in elliptical orbit about earth travels fastest when it moves
Close to earth
A spacecraft on its way from earth to the moon is pulled equally by earth and the moon when it is
Closer to the moons surface
Acceleration is greatest for a satellite in elliptical orbit when it is
Closest to earth
A rock is thrown upward at 50 degrees with respect to the horizontal. As it rises its vertical component of velocity
Decrease
When the distance between two stars doubles the force between them
Decrease by one quarter
