Chapters: 6-10 (Quizzes)
75 degrees
A projectile is launched from ground level at 15° above the horizontal and lands downrange. What other projection angle for the same speed would produce the same down-range distance?
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
Sphere
A ring, a disk, and a solid sphere begin rolling down a hill together. Which reaches the bottom first?
Momentum
A same-size iron ball and wooden ball are dropped simultaneously from a tower and reach the ground at the same time. The iron ball has a greater
50 W
A toy elevator is raised from the ground floor to the second floor in 20 seconds. The power needed using 1000 J of work, is
vertical component
Nellie tosses a ball upward at an angle. Assuming no air resistance, which component of velocity changes with time?
1/3
On a balanced seesaw, a boy three times as heavy as his partner sits ___ the distance from the fulcrum
tangential velocities
Planets would crash into the Sun if it weren't for their
all of the above
The air in this room has Weight. Energy Mass All of the above None of the above
6 kg m/s
The change in momentum that occurs when a 1.0 kg ball traveling at 4.0 m/s strikes a wall and bounces back at 2.0 m/s is
2 m/s
The circumference of a bicycle wheel is 2 meters. If it rotates at 1 revolution per second then its linear speed is
Above a place of support
The famous Leaning Tower of Pisa doesn't topple over because its center of gravity is
shrinking radius
The force of gravity acting on you will increase if you stand on the planet with a
Elliptical Orbit
The force of gravity does work on a satellite when it is in
Closest to the Sun
The kinetic energy of a planet is maximum when it is
16 kg
The mass of a ball moving at 3 m/s with a momentum of 48 kg m/s is
Energy
The unit kilowatt-hour is a unit of
40 J
The work done in pushing a TV set a distance of 2 m with an average force of 20 N is
parts of a body
Tidal forces in general are the result of unequal forces acting on different
2.0 J
A 1-kg ball dropped from 2 m rebounds only 1.5 m after hitting the ground. The amount of energy converted to heat is about more than
1/3 m/s
A 1-kg glider and a 2-kg glider both slide toward each other at 1 m/s on an air track. They collide and stick. The combined mass moves at
80 J
A 2-kg ball is held 4 m above the ground. Relative to the ground its potential energy is
1 m/s
A 2-kg rifle that is suspended by strings fires a 0.01-kg bullet at 200 m/s. The recoil velocity of the rifle is about
600 m
A bullet is fired horizontally with an initial velocity of 300 m/s from a 20-m high tower. If air resistance is negligible, the bullet hits downrange about
4 X greater
A flywheel's diameter is twice that of another of the same shape and mass. Rotational inertia of the larger flywheel is
electrical force
A force that determines the chemical properties of an atom is an
The one dropped
A hunter on level ground fires a bullet at an angle of 10 degrees above the horizontal while simultaneously dropping another bullet from the level of the rifle. Which bullet will hit the ground first?
2000 N
A hydraulic jack is used to lift objects such as automobiles. If the input force is 200 N over a distance of 1 meter, the output force over a distance of 0.1 meter is ideally
Beryllium
A pair of helium nuclei fused together produces
Both forces are the same
A very massive object A and a less massive object B move toward each other under the influence of gravity. Which force, if either, is greater? The force on B The force on A Both forces are the same.
cube; sun
According to Kepler, the orbital period of a planet is directly proportional to the ___ of the planet's average distance from the ___
gravitational force
According to Newton, the greater the masses of interacting objects, the greater the ___ ___ between them
One Quarter
According to Newton, when the distance between two interacting objects doubles, the gravitational force is
Protons
An element is distinct because of its number of
Has different numbers of neutrons for the same element
An isotope is simply an atom that
Rotates Faster
As a huge rotating cloud of particles in space gravitate together forming an increasingly dense ball, it shrinks in size and
direction of motion
Centripetal force does no work on a circularly-moving object because centripetal force has no component in the
16 X
Compared to the mass of a hydrogen atom, the mass of an oxygen atom is ___ as great
All of the above
Compared with a force, a torque involves Leverage Rotation Distance from an axis of rotation All of the above
5000 J
Danny Diver weighs 500 N and steps off a diving board 10 m above the water. Danny hits the water with kinetic energy of
Remain the same
Earth is presently accelerating toward the Sun (centripetal acceleration). If the Sun collapsed into a black hole, this acceleration would
entire universe
Earth's gravitational field extends both inside and outside Earth and throughout the ___ ___
Force & torque must be 0
For a system in mechanical equilibrium, the resultant
62.8 m/min
If you're on a Ferris wheel at a carnival, seated 10 m from the Ferris wheel's axis that makes a complete rotation each minute, your linear speed is
Very Weak
In comparison with other fundamental forces, the universal gravitational constant G indicates that gravity is
Corresponding change in momentum
It is correct to say that impulse is equal to a
Time of contact is increased
To catch a fast-moving ball, you extend your hand forward before contact with the ball and let it ride backward in the direction of the ball's motion. Doing this reduces the force of contact on your hand principally because the
0
Two billiard balls having the same mass and speed roll toward each other. What is their combined momentum after they meet?
4X The Kinetic Energy
Two identical golf carts move at different speeds. The faster cart has twice the speed and therefore has
30 degrees
Two projectiles are fired from ground level at equal speeds but different angles. One is fired at an angle of 30° and the other at 60°. Neglecting air resistance, the projectile to hit the ground first will be the one fired at
Heat
When Joshua brakes his speeding bicycle to a stop, kinetic energy is transformed to
Decreased
When bullets are fired from an airplane in the forward direction, the momentum of the airplane is
Released by the reaction
When carbon and oxygen atoms combine, energy is
9 X
When the distance between two stars decreases by one-third, the force between them increases to ___ as much
Both the same
Whether a truck comes to a stop by crashing into a haystack or a brick wall, the impulse is
Quark
Which is the smallest particle? Quark Neutron Proton Atom Molecule
Air
Which of the following is NOT a compound? Air Ammonia Water alt All are compounds
Neon
Which of the following is a gas? Carbon Lithium Sodium Neon
Both Require The Same
Which task requires more work? Lifting the 25-kg sack 4 meters Lifting the 50-kg sack 2 meters Both require the same Need more information
All of the above
You experience weightlessness In the absence of a supporting surface. Momentarily when you step off a chair. In a freely falling elevator. All of the above