Physics Final Exam

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A 747 jumbo jet has a mass of 30,000 kg. The thrust for each of four engines is 15,000N. What is the jet's acceleration when taking off?: 2 m/s squared
A very massive object A and a less massive object B move toward each other under the influence of mutual gravitation. Which force is greater?: Both forces are the same
suppose the gravitational force between two massive spheres is 10N. If the distance between the spheres is cut in half, what is the force between the masses?: 40N
How many high tides are there normally each day on a typical ocean beach?: 2
Three seconds after starting from rest, a freely falling object will have fallen a distance of about...: 45m
the force of gravity on you is greatest when you are standing...: on Earth's surface
Newton reasoned that the gravitational attraction between Earth and the moon must be...: reduced by distance
suppose you take a trip that covers 240 km and takes 4 hrs to make. Your average speed is..: 60 km/h
If Earth's mass decreased to one half its original mass, with no change in radius, then your weight would..: decrease to 1/2 your original weight
If a ball is thrown straight up at a speed of 20 m/s, the total time to return to its starting point is about..: 4 sec
A car accelerates at 2 m/s squared. Assuming the car starts from rest, how much tme does it need to accelerate to a speed of 30 m/s?: 15 sec
a solar eclipse happens when..: the moon is between Earth and the sun
each of us weighs a tiny bit less on the ground floor of a skyskraper than we do on the top floor. one reason for this is that..: the mass of the building attracts you upward
Ten seconds after starting from rest a freely falling object will have a speed of..: 100 m/s
A ball is thrown straight up. At the top of its path its instantaneous speed is..: zero
If you were to weigh yourself in an elevator that is accelerating upward, compared to your ordinary weight you would weigh...: more
if the mass of the Earth increased, with no change in radius, your weight would..: increase also
the vertical height attained by a basketball player who achieves a hang time of 1 full second is about...: 1.2 m
A ball is thrown straight upward at 20 m/s. Ideally (no air resistance), the ball will return to the thrower's hand with a speed of..: 20 m/s
one seconds after starting from rest, a freely falling object will have fallen a distance of about...: 5 m
the value of acceleration due to gravity,: different of different planets, depends on the mass/radius of Earth/Earth's universal gravitational constant
if you could throw a baseball horizontally at a speed of 8 km/s and if there were no air drag and nothing to stop it,..: it would orbit the earth
ocean tides occur mainly because..: of different gravitational pulls of the moon on opposite sides of Earth
Jupiter has more than 300 times the mass of Earth. Yet on Jupiter's surface an object weight only about 3 times as much as t would on Earth. The explanation to this involves Jupiter's..: large radius
If you drop a feather and a coin at the same time in a vacuum tube, which will reach the bottom of the tube first?: neither-they will reach the bottom at the same time
a lunar eclipse happens when..: Earth is between the moon and the sun
A 400-N woman stands on top of a very tall ladder so she is one Earth radius above Earth's surface. How much does she weigh?: 100N
A tennis ball and a solid steel ball the same size are dropped at the same time. Which ball has the greater force acting on it?: the steel ball
why did newton think there was a force acting on the moon?: because the moon moves in a curved path
The reason a tennis ball and a solid steel ball will accelerate at the same rate, in the absence of air is that..: the force acting on them is the same
since Earth is attracted to the sun, why doesn't it fall into the sun?: because it has too much mass to move toward the sun
A ball is thrown straight up. At the top of its path its acceleration is..: 9.8 m/s squared
a vector is a quantity that has..: magnitude and time
the reason the moon does not fall into Earth is that...: the moon has a sufficiently large orbital speed
A lunar month is about 28 days. If the moon were closer to Earth than it is now, the lunar month would be..: less than 28 days
which is more, the gravitational force between Earth and the moon, or between Earth and the sun?: earth-moon
Pressure is defined as...: force by area

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