Answer:
<h2>The ball has kinetic energy.</h2><h2>
Kinetic energy is 945 J</h2>
Explanation:
Kinetic energy = 0.5 x Mass x Velocity²
Here the ball has mass and velocity.
So the ball has kinetic energy.
Kinetic energy = 0.5 x Mass x Velocity²
Mass = 2.1 kg
Velocity = 30 m/s
Kinetic energy = 0.5 x 2.1 x 30²
Kinetic energy is 945 J
Answer:AC generators
Explanation:
In hydroelectricity as the gate in the dam is open,water flow with great pressure through the penstock,the water hits the turbine,which is connected to an AC generator and the turbine begins to rotate,as the turbine begins to rotate,mechanical energy of the rotating turbine is converted to electrical energy in the AC generator
Answer:
7
Explanation:
isotopes are named after there mass number. because there mass number is different and protons no is same
The fact that no heat is transferred between a system and
its surroundings refers to an adiabatic free expansion.
In gas, the adiabatic compression creates
an increase in the temperature while it causes a drop in temperature there is
adiabatic expansion against pressure, or a spring.
<span>
Before being allowed to expand in vacuum, the gas is first contained in an
insulated container.</span>
The work made by or on the
system is zero since there is no external pressure for the gas to enlarge on against.
The first law of thermodynamics then insinuates
that zero is the net internal energy change of the system since the process
does not incorporate any work or heat transfer.
Answer:
Fr = 20 (N)
Explanation: See atached file ( free body diagram)
As for Newton´s low
∑ Fy = 0
-mg + N = 0 ⇒ - 40 + N = 0 ⇒ N = 40 [Newtons]
by definition : Fr = μs * N ⇒ Fr = 0,5 * 40 ⇒ Fr = 20 (N)
∑ Fx = 0 body is at rest
Fe - Fr = 0
Fr > Fe
Fr > 12 (N) the body is at rest
