Answer:
The work done by the weightlifter, W = 700 J
The power of the weightlifter, P = 350 watts
Explanation:
A weightlifter lifts a set of weights a vertical distance, s = 2 m
The force exerted to lift the weight, F = 350 N
The work done by the body is defined as the product of the force applied by the body to the displacement it caused.
W = F x s
= 350 N x 2 m
= 700 J
The work done by the weightlifter, W = 700 J
The time taken by the weightlifter to lift the weight, t = 2 s
The power is defined as the rate of body to do work. It is given by the equation,
P = W / t
= 700 J / 2 s
= 350 watts
Hence, the power of the weightlifter, P = 350 watts
Answer:
Answer if this question neon street sign
Explanation:
may this answer is helpful for you
The insect's velocity is 0.2 meter/second along east.
<h3>What is velocity?</h3>
The rate at which a body's displacement changes in relation to time is known as its velocity. Velocity is a vector quantity with both magnitude and direction. SI unit of velocity is meter/second.
Given parameters:
An insect crawls 4 m east along a hiking path.
Time taken by it: t = 20 seconds.
We have to fine: the insect's velocity, v =?
So, the magnitude of velocity: v= 4/20 meter/second = 0.2 meter/second.
And the direction velocity is along east.
Hence, the insect's velocity is 0.2 meter/second along east.
Learn more about velocity here:
brainly.com/question/18084516
#SPJ1
Answer:
Explanation:
c )
First of all we shall calculate the velocity of bullet just after the collision with the pendulum by applying conservation of momentum law.
v₂ = mv₁ / ( m + M )
v₂ is velocity after the collision , m is mass of bullet v₁ is velocity of bullet and M is mass of pendulum.
v₂ = .030 x 185 / 3.18
= 1.745 m /s
Let the angle of the pendulum’s maximum displacement with the vertical be θ
height attained by the pendulum h = L ( 1 - cosθ) ; L is the length of the string.
Applying conservation of mechanical energy law
mgh = 1/2 m v₂²
m is mass of (bullet+ pendulum) , v₂ is its velocity
g L ( 1 - cosθ) = v₂² / 2
9.8 x 2.85 ( 1 - cosθ) = 1.745² / 2
( 1 - cosθ) = .0545
cosθ = .9455
θ = 19 degree
a ) The vertical component of the pendulum’s maximum displacement.
L ( 1 - cosθ)
= 2.85 ( 1 - .9455
= .155 m
b ) Horizontal component : L sin18
= 3.15 x .30
= .97 m .
Answer:
I think it is D or A
Explanation:
I have not done this in a long time, so sorry if wrong.
