3 years ago

Is work being done on a barbell when a weight lifter is holding the barbell over his head?

Physics

1 answer:

AVprozaik [17]3 years ago

7 0

I don’t see any picture sorry I wish I can help tho

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If you weighed 130 pounds on earth, you would weigh _____pounds on the moon

Aneli [31]

Answer:

152 pounds

Explanation:

4 0

3 years ago

A 3.00 × 10^-6 kg ant rides the second hand of an enormous vertical wall clock. The ant smoothly sweeps a circle of radius 50.0

kotykmax [81]

Answer:

1.65×10⁻⁶ N

Explanation:

m = Mass of ant = $3\times 10^{-6}\ kg$

r = Radius = 50 m

t = Time taken to complete on rotation = 60 seconds

Angular velocity

$\omega=\frac{2\pi}{t}\\\Rightarrow \omega=\frac{2\pi}{60}$

Centripetal acceleration is force that is acting outward

$F_c=m\omega^2r\\\Rightarrow F_c=3\times 10^{-6}\times \left(\frac{2\pi}{60}\right)^2\times 50\\\Rightarrow F_c=1.65\times 10^{-6}\ N$

The magnitude of the upward force felt by the ant due to the second hand would be 1.65×10⁻⁶ N

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3 years ago

Is density the degree of compactness of a substance?

san4es73 [151]

Yes it is, in other simplified terms density compares the amount of matter an object has to its volume.

5 0

3 years ago

What is the power of a machine that transfers 15,000J of energy in 1 minute?

____ [38]

Answer:

answer is 250 W

Explanation:

W=P * t

t=60s

W= 15000J

15000= P * 60

P= 15000/60

P= 250W. (SI unit of power Watt)

5 0

3 years ago

A potential energy function is given by U(x)=(3.00J)x+(1.00J/m^2)x^3. What is the force function F(x) (in newtons) that is assoc

snow_lady [41]

Answer:

$F(x)=-3 N -(3N/m^2) x^2$

Explanation:

The force is equal to the negative of the derivative of the potential energy function:

$F=-\frac{dU}{dx}$

In this problem, the potential energy function is

$U(x)=3 x + 1 x^3$

Therefore, the force function is:

$F(x)=-\frac{dU}{dx}=-\frac{d}{dx}(3x+1x^3)=-3-3x^2$

So, adding the units of measurement,

$F(x)=-3 N -(3N/m^2) x^2$

4 0

4 years ago