The core of a star must be at the temperature of 10,000,000 degrees Celsius for hydrogen fusion to begin.
The statement "<span>The maximum intensity increases, and the peak wavelength decreases."</span> is true regarding how black body radiation changes as the temperature of the radiating object increases. Temperature is directly proportional to intensity but inversely proportional to the wavelength.
Answer:
Approximately . (Assuming that the drag on this ball is negligible, and that .)
Explanation:
Assume that the drag (air friction) on this ball is negligible. Motion of this ball during the descent:
- Horizontal: no acceleration, velocity is constant (at is constant throughout the descent.)
- Vertical: constant downward acceleration at , starting at .
The horizontal velocity of this ball is constant during the descent. The horizontal distance that the ball has travelled during the descent is also given: . Combine these two quantities to find the duration of this descent:
.
In other words, the ball in this question start at a vertical velocity of , accelerated downwards at , and reached the ground after .
Apply the SUVAT equation to find the vertical displacement of this ball.
.
In other words, the ball is below where it was before the descent (hence the negative sign in front of the number.) The height of this cliff would be .
"Hertz" is the SI unit for measuring how many times a wave,pendulum etc. oscillates in 1 secound.
We can solve the problem by using conservation of momentum.
The player + ball system is an isolated system (there is no net force on it), therefore the total momentum must be conserved. Assuming the player is initially at rest with the ball, the total initial momentum is zero:
The total final momentum is:
where is the momentum of the player and is the momentum of the ball.
The momentum of the ball is:
While the momentum of the player is: , where M=59 kg is the player's mass and vp is his velocity. Since momentum must be conserved,
so we can write
and we find
and the negative sign means that it is in the opposite direction of the ball.