Answer:
Explanation:
Given
Weight of rifle 
mass of rifle 
mass of bullet 
speed of bullet 
As there is no net force on the bullet-rifle system therefore momentum is conserved
i.e. opposite to the direction of bullet speed
(b)Weight of Man 
Combined weight of man and rifle
mass of man-rifle system 
Now man and rifle combinedly recoil
therefore
Reflection. It occurs when a wave bounces from the surface of an obstacle
Answer:
maximum speed = 1.55 m/s
speed is 0.775 m/s
Explanation:
given data
mass m = 0.25 kg
spring constant k = 15 N/m
amplitude A = 20 cm = 0.2 m
to find out
maximum speed and speed at the 1/2 amplitude
solution
we know formula for maximum speed that is
maximum speed = amplitude ×√(k/mass)
put all value
maximum speed = 0.2 ×√(15/0.25)
maximum speed = 1.55 m/s
and
at the 1/2 amplitude
we apply here conservation of energy that is
1/2 × m×v² = 1/2 × k×x²
here we know x = A/2 that is 20 /2 = 10 cm = 0.1 m
so
0.25 v² = 15 × 0.1²
v² = 0.600625
v = 0.775
so speed is 0.775 m/s
<span>4.2m/s
KE =(1/2)mv^2
insert your numbers to find how much kinetic energy you have.
then double that number and solve for v
which gives you how fast the sled will have to go in order to reach that kinetic energy</span>
Earth's surface warms up in the sunlight. At night, Earth's surface cools, releasing the heat back into the air. But some of the heat istrapped<span> by the greenhouse </span>gases<span> in the </span>atmosphere<span>. ... Greenhouse </span>effect<span> of Earth's </span>atmosphere<span> keeps some of the Sun's energy from escaping back into space at night.</span>
