Answer
given,
mass of the ball = 300 g
= 0.3 Kg
maximum altitude of the ball = 10.1 m
Potential energy of the softball:
PE = m g h
PE = 0.3 x 9.8 x 10.1
PE = 29.69 J
Maximum kinetic energy at which the ball is released from hand to reach height of 10.1 m is 29.69 J.
Kinetic energy at which ball returns to your hand is equal to 29.69 J.
speed of the ball
v² = 197.93
v = 14.069 m/s
state of matter is tha ans
Answer:
Mass of bike = 38 kg.
Explanation:
Kinetic energy is given by the expression, , where m is the mass and v is the velocity.
Here speed of child riding bike = 6 m/s
Mass of child = 30 kg
Total kinetic energy = 1224 J
Let the mass of bike be, m kg
So, total mass of child and bike = (m + 30) kg
Substituting,
So, mass of bike = 38 kg.
Answer:
Increase the amplitude
Explanation:
The energy conveyed by a wave is directly proportional to the square of its amplitude. Thus; E ∝ A²
This means that increasing the amplitude will lead to an increase in the energy.
Now, the amplitude of a wave is the height of a wave from it's highest point known as the peak, to the lowest point on the wave known as the trough whereas wavelength refers to the length of a wave from one peak to the next.
This means that increasing the amplitude has no effect on the wavelength.
Answer:
d = 5 inch
Explanation:
First to all we need to get the expression to calculate the horsepower.
The expression to use is the following:
hp = k * v * d³ (1)
Where:
hp: horsepower
v: speed (in rpm)
d: diameter
k: constant of horsepower.
The value of k, because is a constant, will be the same when the shaft is transmiting 375 hp at 50 rpm. So, with the first data, we can calculate the value of k, and then, the value of the diameter
Solving for k in (1) we have:
k = hp / v * d³
replacing the data:
k = 36 / 75 * 2³
k = 0.06
With this value, we can solve for d and we have:
d = ∛hp / k * v
d = ∛375 / 50 * 0.06
d = 5 inch