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3 years ago

Select the choice that best completes the following sentence. Simple machines

Physics

2 answers:

AnnZ [28]3 years ago

5 0

Are the devices that change the magnitude and/or direction of a force.

morpeh [17]3 years ago

3 0

Simple machines are pullys ramps and more thaks 4 pointz

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when a circular plate of metal is heated in an oven, its radius increases at .03 cm/min, at what rate is the area increasing whe

Alinara [238K]

Answer:

Rate of change of area will be $9.796cm^2/min$

Explanation:

We have given rate of change of radius $\frac{dr}{dt}=0.03cm/min$

Radius of the circular plate r = 52 cm

Area is given by $A=\pi r^2$

So $\frac{dA}{dt}=2\pi r\frac{dr}{dt}$

Puting the value of r and $\frac{dr}{dt}$

$\frac{dA}{dt}=2\times 3.14\times 52\times 0.03=9.796cm^2/min$

So rate of change of area will be $9.796cm^2/min$

6 0

3 years ago

How many electrons would it take to equal the mass of a proton? Use two significant figures.

mezya [45]

How many electrons would it take to equal the mass of a proton:
Here's one way of finding the value of it:
=> number of electrons is equivalent to 1 proton.
Let's have an example.
1.6726*10 -24g
_______________
1 proton
______________
9.109*10- ^28g
_______________
1 electron

Based on the given example above, the electrons is 1 839 per 1 proton.
It's about 1800 electrons/proton.

5 0

3 years ago

Will mark brainlest helpp!!!!!!

Luda [366]

Answer:

I don't know if it is correct or not.

6 0

3 years ago

Read 2 more answers

If an apple experiences a constant net force, it will have a constant

Evgesh-ka [11]

Answer:

As Force = Mass × Acceleration. So If mass is constant, the acceleration would also be constant, in presence of a net external constant force!

7 0

3 years ago

Two skaters stand facing each other. One skater's mass is 60 kg, and the other's

jeyben [28]

Answer:

v' = 2.4 m/s

Explanation:

Given that,

Mass of one skater, m = 60 kg

Mass of the other's skater, m' = 60 kg

The two skaters push off each other. After the push, the smaller skater has a velocity of 3.0 m/s.

When there is no external force acting on a system, the momentum remains conserved. It means initial momentum is equal to the final momentum. Let v' is the velocity of the larger skater.

mv = m'v'

$v'=\dfrac{mv}{m'}\\\\v'=\dfrac{60\times 3}{75}\\\\v'=2.4\ m/s$

So, the velocity of the larger skater is 2.4 m/s.

3 0

3 years ago