The answer is c. the force of his swing
At the time of the impact, there is a collision between two bodies moving in opposite directions.
The force exerted on the ball causes the change of velocity.
The movement of tectonic plates can cause earthquakes. Some can be major and some can be minor. Both can affect non-earthquake proof buildings though
if rebecca stands in front of david at a distance of do and david perceives the position of rebecca at di, di will be +84 cm
<h3>What is focal length ?</h3>
How strongly light converges or diverges depends on an optical system's focal length, which is the inverse of optical power. A system with a positive focus length is said to converge light, whereas one with a negative focal length is said to diverge light.
focal length = +60 cm
magnification m = -0.40
focal length being positive an magnification negative.
given lens is a convex lens.
for a lens
m = di/do and 1/f = (1/di) - (1/do)di
= -0.4do1/f = (1/-0.4do) - 1/do do
= -210 cmdi = -0.4 * -210
di = +84 cm
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The mass of the box is 8.5 kg.
<h3>What is mass?</h3>
Mass can be defined as the quantity of matter contained in a body.
To calculate the mass of the box, we use the formula
Formula:
- F = mgμ............. Equation 1
Where:
- F = Force
- m = mass of the box
- g = acceleration due to gravity
- μ = coefficient of friction
Make m the subject of the equation
- m = F/gμ..................... Equation 2
From the question,
Given:
- F = 25 N
- g = 9.8 m/s²
- μ = 0.3
Substitute these values into equation 2
- m = 25/(0.3×9.8)
- m = 25/2.94
- m = 8.5 kg
Hence, the mass of the box is 8.5 kg.
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Given that,
Mass of a baseball, m = 0.2 kg
Initial speed of a baseball, u = 30 m/s
Force produced by a bat, F = 2000 N
Final speed of a baseball, v = -50 (negative for opposite direction)
To find,
For how long was the ball in contact with the bat?
Solution,
Let for t seconds the ball is in contact with the bat. The net force acting on the ball is given by :
So, the ball is contact with the bat for 8 ms.
