一道英文物理题求解（有点难）A block starts from rest and slides without friction along the surface of a hemisphere of radius R= 4.90 m. As the block slides, eventually it loses contact with the hemisphere.1.Select all the statements th

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一道英文物理题求解（有点难）A block starts from rest and slides without friction along the surface of a hemisphere of radius R= 4.90 m. As the block slides, eventually it loses contact with the hemisphere.1.Select all the statements th
一道英文物理题求解（有点难）

A block starts from rest and slides without friction along the surface of a hemisphere of radius R= 4.90 m. As the block slides, eventually it loses contact with the hemisphere.

1.Select all the statements that are correct; e.g., if A and D are correct and the rest are incorrect, enter AD. If none are correct, enter N.

At the moment the block leaves the surface, its acceleration is parallel to its velocity.

Before the block leaves the surface of the hemisphere, the only forces that act on it are gravity and the normal force.

While the block slides along the surface of the hemisphere, its acceleration only has a component perpendicular to its velocity.

As the block slides downward, the magnitude of the normal force on the block increases.

The magnitude of the change in potential energy of the block as it moves is equal to the magnitude of the change in its kinetic energy.

2.When the block is at an angle θ=17.8°, what percentage of the block's weight is the component perpendicular to the surface of the hemisphere? Don't enter units.

3.When the block is at an angle θ=15.0°, what is the speed of the block?

4.What is the speed of the block when it loses contact with the hemisphere?

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一道英文物理题求解（有点难 ）A block starts from rest and slides without friction along the surface of a hemisphere of radius R= 4.90 m. As the block slides, eventually it loses contact with the hemisphere.1.Select all the statements th

一道英文物理题求解（有点难）A block starts from rest and slides without friction along the surface of a hemisphere of radius R= 4.90 m. As the block slides, eventually it loses contact with the hemisphere.1.Select all the statements th