Answer:
-2250 N
Explanation:
From the question,
Using.
F = m(v-u)/t .................. Equation 1
Where F = Average force the bat apply to the ball, m = mass of the ball, v = final velocity of the ball, u = initial velocity of the ball, t = time.
Given: m = 0.15 kg, v = -50 m/s(reversed direction), u = 40 m/s, t = 6.0×10⁻³ s = 0.006 s.
Substitute into equation 1
F = 0.15(-50-40)/0.006
F = 0.15(-90)/0.006
F = -2250 N.
The force is negative because it opposes the initial motion of the ball.
Hence the bat average force = -2250 N
Answer:
Second equation
Explanation:
Solution:-
- Assuming that the initial and final rotational speed of the turn-table are known and the turntable have the a non zero constant angular acceleration (α):
α = (wf - wi) / t
t = (wf - wi) / α
- From the equation above we can directly find the time taken by the turntable to achieve the desired rotational speed. Where,
wi : initial rotational speed
wf : final/desired rotational speed
- The formula can be re-arranged to get:
wf = wi + α*t ...... (second equation in the list given)
<h2>
Answer: evaporation</h2>
Explanation:
Evaporation fog occurs when surface air is much colder and relatively less saturated than water. Then, when the water evaporates, it inmediately condenses again in small drops of water that stay suspended very close to this body of water.
In other words: This type of fog occurs when cold air moves over warmer water. And it is this difference in temperature that contributes to the formation of fog over the lakes, especially near the polar regions.
Answer:
50m [N]
Explanation:
Think of these directions as if they were on a 2D plane. (if you're talking about displacement)
If you go 32m [N] then 6m [S], it's like you're moving backwards (-). (thus, 32n-6s=26m [N])
Next, you go north again, so moving forwards (+). (thus, 26n+24n=50m [N])
It rises till all of its Kinetic energy is converted into potential energy.
so, mgh=(1/2)m(v^2)
so, h=(v^2)/2g = 12*12/(2*9.81)=7.34 m
