A ball is thrown with a speed of 30 m/s at an angle of 10 degrees. when is the vertical component of the velocity equal to zero? a) when the ball has zero acceleration
b) when the ball first touches the ground
c) at the top of the balls trajectory
d) when the ball is first thrown
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c) at the top of the balls trajectory

Explanation:

If the ball is thrown at an upward angle, the ball will rise upwards to a certain highest point and then change direction and start to fall downwards. All this happens when the ball is also travelling horizontally, which causes the ball to travel in an arc.

If we consider the point where the ball reaches its highest point in its trajectory, we realize that at this point (where the ball actually switches directions from upward to downward), the ball actually momentarily pauses vertically (it still moves horizontally, but it is neither moving up or down)

At this point (i.e at the top of its trajectory), the ball has zero vertical velocity.

part 1: describe the mass and the surface temperature of dwarf stars.

part 2: explain using complete sentences where on the hr diagram you would expect to find a dwarf star based on its physical properties.

part 1: the mass of a dwarf star is very small and the surface temperature of dwarf stars are high and they have the lowest absolute brightness.

part 2: on the hr diagram you would expect to find a dwarf star based on its physical properties at an absolute brightness of -2 to -4

hope this