The power of the laser is
by using the relationship between power, energy and time, we can find the energy delivered by the laser in 1 second:
The frequency of the photons of this light is given by
and the energy of a single photon is
In order to find the number of photons emitted per second, we must divide the total energy emitted by the laser by the energy of a single photon, and we get:
Answer:
45 s .
Explanation:
The accelerator will first accelerate , then move with uniform velocity and at last it will decelerate to rest .
displacement s = ?
acceleration a = 1 m /s²
Final speed v = 5 m/s
initial speed u = 0
v² = u² + 2as
5² = 0 + 2 x 1 x s
s = 12.5 m
B) Let time of acceleration or deceleration be t
v = u + a t
5 = 0 + 1 t
t = 5 s
Similarly displacement during deceleration = 12.5 m
Total distance during uniform motion = 200 - ( 12.5 + 12.5 ) = 175 m .
velocity of uniform motion = 5 m /s
time during which there was uniform velocity = 175 / 5 = 35 s
Total time = 5 + 35 + 5 = 45 s .
Let's see
Now we know the formula of acceleration
Or
Answer:
FALSE
Explanation:
When object float in water then it means that weight of the object is counterbalanced by the buoyancy force.
Here as we know that buoyancy force is the weight of water displaced by the object.
So here when object is submerged into the water then the submerged part of the volume of object will displace exactly the same volume of water and that volume of water will exert upwards buoyancy force on the object.
So here this statement is not true as it says that volume of water displaced is volume above the surface of water while it must be like volume of water displaced must be equal to volume of submerged part of the object.
Answer:
the one above the surface of earth
Explanation:
earth has gravity the ball of the moon would float away
