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Nataliya [291]
3 years ago
5

Imagine that a machine enables you to do 100 joules of work with a force input of 20 newtons. Now imagine that a new machine is

invented that lets you do the same amount of work with a force input of just 10 newtons.The NEW machine makes you how many times stronger than the old one?
a.one-half as strong
b.twice as strong
c.three times as strong
d.ten times as strong
Physics
1 answer:
netineya [11]3 years ago
8 0
The machine will make you twice a s strong

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saveliy_v [14]

Answer:

The speed it reaches the bottom is

v=6.51m/s

Explanation:

Given: m=5.0kg, r=47cm\frac{1m}{100cm}=0.47m

Using the conservation of energy theorem

U_i=K_E+K_{ER}

m*g*h=\frac{1}{2}*m*v^2+\frac{1}{2}*I*w^2

v=r*w, I=\frac{1}{2}*m*r^2

m*g*h=\frac{1}{2}*m*(r*w)^2 +\frac{1}{2}*[\frac{1}{2} *m*r^2]*w^2

m*g*h=\frac{3}{4}*m*r^2*w^2

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Solve to w'

w^2=\frac{4*g*h}{3*r^2}

h=x*sin(30)=6.5m*sin(30)=3.25m

w=\sqrt{\frac{4*9.8m/s^2*3.25m}{3*(0.235m)^2}}

w=27.74rad/s

v=27.74rad/s*0.235m=6.51m/s

7 0
3 years ago
During a tennis serve, a racket is given an angular acceleration of magnitude 150 rad/s^2. At the top of the serve, the racket h
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Answer:

270 m/s²

Explanation:

Given:

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ω = 12.0 rad/s

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a

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The tangential component is:

at = αr

at = (150 rad/s²)(1.30 m)

at = 195 m/s²

The radial component is:

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Increasing the temperature causes an increase in the average kinetic energy of the particles of a material.

<h3>What is average kinetic energy of particles?</h3>

The average kinetic energy of particles is the energy possessed by particles due to their constant motion.

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Thus, we can conclude that, increasing the temperature causes an increase in the average kinetic energy of the particles of a material.

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