The moon surface is
visible to an observer on earth due to the gravitational force that attracts
the moon to the earth. The more massive the body is, the more the smaller body
is attracted to the larger body. We can only see the side of the moon due to
the speed at which the moon rotates.
Answer:
44.27 m/s
Explanation:
Let's set the upwards direction to be positive and the downwards direction to be negative.
Since we do not know the final velocity of the ball right before it hits the ground, we will use our knowledge that the final velocity of the ball is 0 m/s right before it changes direction to fall back to the ground.
- a = -9.8 m/s²
- Δy = 100 ft
- v = 0 m/s
- v₀ = ?
Find what constant acceleration equation contains all four variables.
Substitute the known variables into the equation and solve for v₀, the initial velocity.
- (0)² = v₀² + 2(-9.8)(100)
- 0 = v₀² - 1960
- 1960 = v₀²
- v₀ = 14√10 = 44.27188724
The initial velocity of the ball 44.27 m/s.
<span>3-3√3i is the answer my friend </span>
Answer:
c. the work done by the environment on the system equals the changein internal energy.
Explanation:
Adiabatic process:
When the boundary of a system is perfectly insulated, it means that the energy can not flow from the system and into the system ,these system is known as adiabatic system.
When the energy transfer in the system is zero ,then these type of process is known as adiabatic process.
From the first law of thermodynamics
Q= ΔU + W
Q=Heat transfer
ΔU=Change in internal energy
W=Work transfer
In adiabatic process , Q= 0
Therefore
0=ΔU +W
W=- ΔU
Negative sign indicates that ,the work done by the environment.
Therefore the correct option will be (c).
Answer:
Explanation:
Given
Beta rocket has twice the mass of Alpha engine
suppose alpha has a mass of m so beta has 2 m mass
Thrust force on alpha is F
thrust force on beta is 2 F
Acceleration of alpha 
Acceleration of beat 
Therefore acceleration of alpha and beta is same
