PHYS 250 midterm 2
conceptual (31 questions &
answers)
F = GMm/R2...... If the gravitational force on an object is directly
proportional to its mass, why don't objects with large masses fall
with greater acceleration than small ones? - answer The
acceleration is equal to the net force divided by the mass.
For objects near the surface of the Earth, the universal law of
gravitation can be simplified to F = mg, where g = 9.81 m/s2. If
the mass of the Earth were doubled while at the same time its
radius remained constant, by what factor would this change its
acceleration due to gravity at it's surface? - answer 2
If the radius of the Earth were doubled while at the same time its
mass remained constant, by what factor would this change its
acceleration due to gravity at the surface? - answer 1/4
In this problem, we are going to consider the impulse acting on a
baseball as it is thrown by one person and caught by another. The
ball is caught and thrown from the same height... Is the following
statement true or false: "If we ignore the resistance caused by air,
the throw must impart a greater impulse on the ball because the
act of throwing takes more time than catching." - answer FALSE
An object's speed is increased by a factor of three. How does the
object's momentum change? - answer It increases by a factor of
three.
, An object's speed is increased by a factor of three. How does the
object's kinetic energy change? - answer Increased by a factor of
nine.
An object in freefall is accelerating downwards, so its velocity is
continually increasing. Because of this, its momentum is
continually increasing as well, apparently contradicting the
principle of conservation of momentum... Which of Newton's laws
can we use to show that momentum is actually being conserved
for an appropriately defined system? - answer Newtons 3rd Law
In this section we are learning the difference between elastic
collisions and inelastic collisions. Regardless of the type of
collision, what is always conserved? - answer Momentum
A moving object collides with a second object at rest on a
frictionless surface. After the collision, is it possible that both of
the two objects remain at rest? - answer No - because of the initial
momentum, one of the objects must maintain a velocity.
A hockey puck is sliding on frictionless ice, in an Eastward
direction. It collides with a second hockey puck, initially
stationary, which then goes off in the Northern direction. What
direction is the first hockey puck moving after the collision? -
answer Southeast
The figure illustrates a uniform metal sheet shaped like a triangle,
with a hole cut in the center. Where is the center of mass of this
conceptual (31 questions &
answers)
F = GMm/R2...... If the gravitational force on an object is directly
proportional to its mass, why don't objects with large masses fall
with greater acceleration than small ones? - answer The
acceleration is equal to the net force divided by the mass.
For objects near the surface of the Earth, the universal law of
gravitation can be simplified to F = mg, where g = 9.81 m/s2. If
the mass of the Earth were doubled while at the same time its
radius remained constant, by what factor would this change its
acceleration due to gravity at it's surface? - answer 2
If the radius of the Earth were doubled while at the same time its
mass remained constant, by what factor would this change its
acceleration due to gravity at the surface? - answer 1/4
In this problem, we are going to consider the impulse acting on a
baseball as it is thrown by one person and caught by another. The
ball is caught and thrown from the same height... Is the following
statement true or false: "If we ignore the resistance caused by air,
the throw must impart a greater impulse on the ball because the
act of throwing takes more time than catching." - answer FALSE
An object's speed is increased by a factor of three. How does the
object's momentum change? - answer It increases by a factor of
three.
, An object's speed is increased by a factor of three. How does the
object's kinetic energy change? - answer Increased by a factor of
nine.
An object in freefall is accelerating downwards, so its velocity is
continually increasing. Because of this, its momentum is
continually increasing as well, apparently contradicting the
principle of conservation of momentum... Which of Newton's laws
can we use to show that momentum is actually being conserved
for an appropriately defined system? - answer Newtons 3rd Law
In this section we are learning the difference between elastic
collisions and inelastic collisions. Regardless of the type of
collision, what is always conserved? - answer Momentum
A moving object collides with a second object at rest on a
frictionless surface. After the collision, is it possible that both of
the two objects remain at rest? - answer No - because of the initial
momentum, one of the objects must maintain a velocity.
A hockey puck is sliding on frictionless ice, in an Eastward
direction. It collides with a second hockey puck, initially
stationary, which then goes off in the Northern direction. What
direction is the first hockey puck moving after the collision? -
answer Southeast
The figure illustrates a uniform metal sheet shaped like a triangle,
with a hole cut in the center. Where is the center of mass of this
