<span>A.frictional effects dissipate energy.</span>
Answer:
4400 Joules
73.33 Joules
25.9325 Joules
Explanation:
P = Power = 800 W
t = Time = 22 s
F = Force
r = Radius of arm = 90 cm
Energy
As the efficiency is 25%
Energy used in the race is 4400 Joules
Half of the energy is used in the arm
So, per stroke of paddle
The energy expenditure per arm stroke is 73.33 Joules
Displacement will be the half of the perimeter of the circle
Work done
The average force of the hand on the water is 25.9325 Joules
On a roller coaster, energy changes from potential to kinetic energy and back again many times over the course of a ride. Kinetic energy is energy that an object has as a result of its motion. ... Traditionally, the coaster cars are pulled up the first hill by a chain; as the cars climb, they gain potential energy.
Answer:
24
Explanation:
When you multiply a fraction by a whole number, the numerator of the fraction and the whole number are multiplied together. The denominator of the fraction stays the same, so in this case you would end up with 72/3. This simplifies to 24.
Answer:
B
Explanation:
This happens because adding salt to the water decreases Its density. When the density of the water matches that of the egg, the egg becomes neutrally buoyant and floats.
The weight of the egg becomes equal to the upward buoyant force by the water on to the egg and hence, the egg floats.
