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Citrus2011 [14]
3 years ago
13

A student weighing 700 N climbs at constant speed to the top of an 8 m vertical rope in 10 s. The average power expended by the

student to overcome gravity is most nearly
1.1 W
87.5 W
560 W
875 W
5600 W
Physics
1 answer:
nasty-shy [4]3 years ago
3 0

Answer:

The average power the student expended to overcome gravity is 560W, Watts is a units of work it is Joules /time or kg*m^{2}/ s^{3}

Explanation:

Weight = 700N

F= m*g*h \\m*g= 700N\\F= 700N*h\\F=700N*8m\\F= 5600 N*m \\F=5600 J

The power is the work in (Joules) or (N*m) in a determinate time (s) to get Watts (W) units for work

Work= \frac{5600 J}{10s} = \frac{5600 \frac{kg*m^{2} }{s^{2} } }{10 s}  \\Work= 560\frac{kg*m^{2} }{s^{3} } \\Work =560 W

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When numbers are very small or very large, it is convenient to either express the value in scientific notation and/or by using a
Oxana [17]

Answer:

5 mg, 5\cdot 10^{-3}g

Explanation:

First of all, let's rewrite the mass in grams using scientific notation.

we have:

m = 0.005 g

To rewrite it in scientific notation, we must count by how many digits we have to move the dot on the right - in this case three. So in scientific notation is

m=5\cdot 10^{-3}g

If  we want to convert into milligrams, we must remind that

1 g = 1000 mg

So we can use the proportion

1 g : 1000 mg = 0.005 g : x

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x=\frac{(1000 mg)(0.005 g)}{1 g}=5 mg

4 0
3 years ago
which of the following locations has the largest electric field? A)0.4 cm from a +3.0 uC point charge B)0.2 cm frm a +1.5 uC poi
JulsSmile [24]
<span>Electric field is proportional to q/d^2, where q is the magnitude of the charge and d is the distance. Since all the given units are identical, we can just compare their relative magnitudes without calculating for the exact values.
A) 3/(0.4)^2 = 18.75
B) 1.5/(0.2)^2 = 37.5
C) 6/(0.4)^2 = 37.5
D) 3/(0.2)^2 = 75
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7 0
3 years ago
What is the relation between inertia and mass?
skelet666 [1.2K]

Answer:

"The tendency of an object to resist changes in its state of motion varies with mass. Mass is that quantity that is solely dependent upon the inertia of an object. The more inertia that an object has, the more mass that it has. A more massive object has a greater tendency to resist changes in its state of motion."

Explanation:

I hope this helps! <3

3 0
3 years ago
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3 years ago
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A potter's wheel rotating at 355 rev/min is switched off and rotates through 76.0 revolutions prior to coming to rest. What is t
Aliun [14]

Answer:

-1.44707 rad/s²

Explanation:

\omega_f = Final angular velocity

\omega_i = Initial angular velocity = 355 rpm

\alpha = Angular acceleration

\theta = Angle of rotation = 76 rps

Converting rpm to rad/s

1\ rpm=\frac{2\pi}{60}\ rad/s

Converting rps to rad/s

1\ rps=2\pi \ rad/s

Equation of rotational motion

\omega_f^2-\omega_i^2=2\alpha \theta\\\Rightarrow \alpha=\frac{\omega_f^2-\omega_i^2}{2\theta}\\\Rightarrow \alpha=\frac{0^2-355\times \frac{2\pi}{60}^2}{2\times 2\pi \times 76}\\\Rightarrow \alpha=-1.44707\ rad/s^2

The constant angular acceleration of the potter's wheel during this interval is -1.44707 rad/s²

4 0
3 years ago
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