2.5 watt
Explanation:
we know
power = work done /time
work done gainst gravity is = mgh
as mg = weight = force = 5 N
and height = 2 m
so work done = mgh = 5*2 = 10N
therefore ,
Power = 10/4 = 2.5 watt
Answer:
<em>The block moves at 1.25 m/s</em>
Explanation:
<u>Law Of Conservation Of Linear Momentum
</u>
It states the total momentum of a system of bodies is conserved unless an external force is applied to it. The formula for the momentum of a body with mass m and speed v is
P=mv.
If we have a system of two bodies, then the total momentum is the sum of the individual momentums:
If a collision occurs and the velocities change to v', the final momentum is:
Since the total momentum is conserved, then:
P = P'
Or, equivalently:
The bullet of m1=0.049 kg moves at v1=421 m/s. Then it strikes a wooden block of m2=4.7 kg originally at rest (v2=0).
After the collision, the bullet continues at v1'=301 m/s. The speed of the block can be calculated by solving for v2':
Calculating:
The block moves at 1.25 m/s
Answer:
d). The value of y should be -32m
Vx=0.92 m/s
Explanation:
Using equation of motion uniform to y motion
So to find t that is the same time for all the motion
The value of Xf=-3.2m because the g is negative from the axis
Now in the axis 'x' to find Vx
Answer:
Explanation:
In space station artificial gravity is created by rotational motion of space station
Centifugal acceleration creates artificial gravity
ω²r = g
ω² x 400 = 9.8
ω² = 9.8 /400
ω = .1565 rad /s
no of turns per min ω / 2π per sec = 1.56 rev per min .
For Mars
Same theory will apply
ω²r = g
ω² x 400 = 3.7
ω² = 3.7 /400
ω = . 096 rad /s
n = ω / 2π
= .096 / 2π
=.01528 per sec
per min
= .9168 per min .