Answer:
Q = 1128.6 [kW] - kilowatts
Explanation:
To calculate the amount of energy required, the following expression should be used:
Q = 15*4.18*(38-20)
Q = 1128.6 [kW]
Acceleration is the rate of change of the velocity of an object.
The answer would be c.
your equation should look like:
reactants-----> products
Answer:
- The impulse exerted by the ball is 7.2 kg.m/s
- The average force exerted on the ball by the bat is 600 N.
Explanation:
Given;
mass of the baseball, m = 0.144 kg
velocity of the baseball, v₁ = 20 m/s
velocity of the batter, v₂ = -30 m/s (opposite direction to the ball's speed)
The impulse exerted by the ball is calculated as follows;
J = ΔP = mv₁ - mv₂
ΔP = m(v₁ - v₂)
ΔP = 0.144 [20 - (-30)]
ΔP = 0.144 ( 20 + 30 )
ΔP = 0.144 (50)
ΔP = 7.2 kg.m/s
The average force exerted on the ball by the bat is calculated as;
Answer:
3.7 m/s^2
Explanation:
The period of a pendulum is given by:
where L is the length of the pendulum and g is the free-fall acceleration on the planet.
In this problem, we know that the period of the pendulum on Earth is:
while the period of the same pendulum on Mars is
And since the length of the pendulum L does not change, we can write:
where
is the free-fall acceleration on Earth
is the free-fall acceleration on Mars
Re-arranging the equation and substituting numbers, we find: