Chapter 10- Physics
80 m
A ball is dropped from rest off a cliff, and it hits the ground in 4 seconds. How far did it drop?
5 m/s
A ball is kicked so that initially its horizontal velocity is 5 m/s and its vertical velocity is 10 m/s. When the ball is at its highest point above the ground, what is its horizontal velocity?
You
A ball is thrown horizontally from a cliff at a speed of 10 m/s . You predict that its speed 1 s later will be slightly greater than 14 m/s . Your friend says it will be 10 m/s.Who is correct?
45 m
A ball is thrown vertically upward with an initial speed of 10 m/s, and it reaches a maximum height of 5 m. If the ball is thrown vertically with an initial speed of 30 m/s, what would its maximum height be?
6 seconds
A ball is thrown vertically upward with an initial speed of 30 m/s. How long does it take to come back down?
3 m
A bird is flying at a constant height 5 meters above the ground and drops an egg with an initial horizontal velocity of 3 m/s. How far does the egg travel horizontally before hitting the ground?
0.5 s.
A bullet fired horizontally over level ground hits the ground in 0.5 second. If it had been fired with twice the speed in the same direction, it would have hit the ground in
it is not acted on by any horizontal forces
A projectile is fired horizontally in a region of no air resistance. The projectile maintains its horizontal component of velocity because
40 degrees
A projectile is fired into the air at an angle of 50 degrees with the ground and lands on a target that is at the same level at which the projectile started. It will also land on the target if it is fired at an angle of
50 m/s
A projectile is launched vertically upward at 50 m/s. If air resistance is negligible, its speed upon returning to its starting point is
decreases
A rock is thrown upward at 50 degrees with respect to the horizontal. As it rises, neglecting air drag, its vertical component of velocity
5 m.
A stone is thrown horizontally from the top of a cliff. One second after it has left your hand, its vertical distance below the top of the cliff is
ellipses
According to Kepler's laws, the paths of planets about the sun are
beneath the plane
An airplane flies at 40 m/s at an altitude of 50 meters. The pilot drops a heavy package which falls to the ground. Where, approximately, does the package land relative to the plane's new position?
1 g downward
An object is dropped and freely falls to the ground with an acceleration of 1 g. If it is thrown upward at an angle instead, its acceleration will be
in December
Earth is closer to the Sun in December than in June. In which of these two months is Earth moving faster around the Sun?
11.2 km/s
Escape speed from Earth is any speed equal to or greater than _______.
5 meters
How far below a straight-line path does a horizontally projected projectile fall in the first second of fall?
smaller
Is the time taken for a complete revolution of a satellite in close orbit about the Earth is smaller or greater than for orbits of greater altitude?
elliptical paths
Kepler was the first to be credited for discovering that planets follow _______.
remains constant
Roll a bowling ball off the edge of a table. As it falls, its horizontal component of velocity
independent of each other
The horizontal and vertical components of velocity for a projectile are _______.
a circular path
The kinetic energy of a satellite remains constant when the satellite follows _______.
about 5 m below the straight line
Throw an object upward at a 45 degree angle. With no gravity it will follow a straight-line path. But because of gravity, at the end of 1 second, it is
Although the planets experience a force of gravity from the Sun, because they are moving, their trajectories bend around the Sun rather than lead directly into the Sun.
Why do the planets orbit the Sun and NOT crash into the Sun?
