A shorter test but I still don't get it (Physics)

As shown in the figure, a given force is applied to a rod in several different ways. In which case is the torque about the pivot P due to this force the greatest?

A) 1. Look at this on the paper because wtf

Two children, Ahmed and Jacques, ride on a merry-go-round. Ahmed is at a greater distance from the axis of rotation than Jacques. Which of the following are true statements? (There could be more than one correct choice.)

Ahmed has a greater tangential speed than Jacques/Jacques and Ahmed have the same angular speed.

The figure shows scale drawing.....which has greater moment of inertia?

B (one that looks like a bike wheel)

Two uniform solid balls, one of radius R and mass M, the other of radius 2R and mass 8M, roll down a high incline. They start together from rest at the top of the incline. Which one will reach the bottom of the incline first?

Both reach the bottom at the same time

Five forces act on a rod that is free to pivot at point P, as shown in the figure. Which of these forces is producing a counter-clockwise torque about point P? (There could be more than one correct choice.)

Force C (top right)

A spinning ice skater on extremely smooth ice is able to control the rate at which she rotates by pulling in her arms. Which of the following statements are true about the skater during this process?

Her angular momentum remains constant

Suppose a uniform solid sphere of mass M and radius R rolls without slipping down an inclined plane starting from rest. The linear velocity of the sphere at the bottom of the incline depends on

Neither the mass nor the radius of the sphere

When is the angular momentum of a system constant?

Only when no net external torque acts on the system.

If the answer to your calculation has units of kg * m^2/s^2, what type of quantity could it be? (Multiple answers)

Rotational kinetic energy, work, torque

A disk and a hoop of the same mass and radius are released at the same time at the top of an inclined plane. If both are uniform, which one reaches the bottom of the incline first if there is no slipping?

The disk

A ballet dancer is spinning in the middle of a horizontal frictionless stage. Which of the following things could be change by moving parts of his body or his whole body? (More than one correct choice)

The location of his center of mass (or center of gravity), his rotational kinetic energy, his moment of inertia, his translational kinetic energy, his total kinetic energy, his angular momentum

When a rigid object rotates about a fixed axis, what is true about all the points in the object?

They all have the same angular acceleration. They all have the same angular speed.

Consider a solid uniform sphere of radius R and mass M rolling without slipping. Which form of its kinetic energy is larger, translational or rotational?

Translational kinetic energy is larger.

If the answer to your calculation has units of kg * m^2/s, what type of quantity could it be? (There could be more than one correct choice.)

angular momentum

Consider a uniform hoop of radius R and mass M rolling without slipping. Which is larger, its translational kinetic energy or its rotational kinetic energy?

both are equal

A person sits on a freely spinning lab stool that has no friction in its axle. When this person extends her arms,

her moment of inertia increases and her angular speed decreases

A solid sphere and a solid cylinder, both uniform and of the same mass and radius, roll without slipping at the same forward speed. It is correct to say that the total kinetic energy of the solid sphere is

less than the total kinetic energy of the cylinder.

A uniform ball is released from rest on a no-slip surface, as shown in the figure. After reaching its lowest point, the ball begins to rise again, this time on a frictionless surface. When the ball reaches its maximum height on the frictionless surface, it is

lower than when it was released.

A small uniform disk and a small uniform sphere are released simultaneously at the top of a high inclined plane, and they roll down without slipping. Which one will reach the bottom first?

sphere

A solid sphere, solid cylinder, and a hollow pipe all have equal masses and radii and are of uniform density. If the three are released simultaneously at the top of an inclined plane and roll without slipping, which one will reach the bottom first?

sphere

A disk, a hoop, and a solid sphere are released at the same time at the top of an inclined plane. They are all uniform and roll without slipping. In what order do they reach the bottom?

sphere, disk, hoop

The rotating systems shown in the figure differ only in that the two identical movable masses are positioned a distance r from the axis of rotation (left), or a distance r/2 from the axis of rotation (right). If you release the hanging blocks simultaneously from rest,

the block at the right lands first

Two equal-magnitude forces are applied to a door at the doorknob. The first force is applied perpendicular to the door, and the second force is applied at 30° to the plane of the door. Which force exerts the greater torque about the door hinge?

the first force (applied perpendicular to the door)

Two forces produce equal torques on a door about the door hinge. The first force is applied at the midpoint of the door; the second force is applied at the doorknob. Both forces are applied perpendicular to the door. Which force has a greater magnitude?

the first force (at the midpoint)

A merry-go-round spins freely when Diego moves quickly to the center along a radius of the merry-go-round. As he does this, it is true to say that

the moment of inertia of the system decreases and the angular speed increases.

Suppose a solid uniform sphere of mass M and radius R rolls without slipping down an inclined plane starting from rest. The angular velocity of the sphere at the bottom of the incline depends on

the radius of the sphere