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dlinn [17]
2 years ago
6

In order for work to be done a___ must be exerted on an object causing it to___

Physics
1 answer:
Fed [463]2 years ago
8 0
In order for work to be done a force must be exerted on an object causing it to move
You might be interested in
2. Which is a possible unit of mass?<br> gram<br> liter<br> meter
Pachacha [2.7K]

Answer:

Gram

Explanation:

Meter is a unit used to measure length and liter is used to measure liquids therefore using process of elimination the answer has to be gram

4 0
3 years ago
satellite is placed in an elongated elliptical (not circular) orbit around the Earth. At the point in its orbitwhere it is close
GrogVix [38]

Answer:

a) v2=4147.72 m/s

b) stotal=5.53x10^6 m

Explanation:

a) the length from the center of the earth is equal to:

L1=1x10^6+((6.37/2)x10^6)=4.18x10^6 m

the velocity is 5.14 km/s=5.14x10^3 m/s

the farthest distance is equal to:

L2=2x10^6+((6.37/2)x10^6)=5.18x10^6 m

As the angular momentum is conserved, we have to:

I1=I2

m*L1*v1=m*L2*V2, where m is the mass of satelite

clearing v2:

v2=(L1*V1)/L2=(4.18x10^6*5.14x10^3)/5.18x10^6=4147.72 m/s

b) Using the Newton 3rd law:

vf^2=vi^2+2as

where:

a=g=9.8 m/s^2

vf=0

vi=5.14 km/s

s=?

Clearing s:

s=(vf^2-vi^2)/(2g)=((0-(5.14x10^3)^2)/(2*9.8)=1.35x10^6 m

the total distance is equal to:

stotal=s+L1=1.35x10^6+4.18x10^6=5.53x10^6 m

8 0
3 years ago
You are rushing to the train station to catch your morning commute. The train leaves the train station from rest with an acceler
Vanyuwa [196]

Answer:

a) t= 4.81 s,and t= 23.51.

b)d=6.88 m

c)v=4.8 m/s

Explanation:

Acceleration of train ,a= 0.6 m/s²

u = 0 m/s

Your speed ,V= 8.5 m/s

Lets take after t time he you catch the train

Distance travel by train in t time

d=ut+\dfrac{1}{2}at^2

d=\dfrac{1}{2}\times 0.6\times t^2  ----------1

d= V ( t- 4)

d= 8.5 ( t- 4)  --------2

By equating equation 1 and 2

0.3 t² =  8.5 ( t- 4)

0.3 t² -8.5 t + 34 = 0

t= 4.81 s and t= 23.51

It means that you will catch train after t= 4.81 s,and t= 23.51.

t=23.51 sec means that you will catch the train after 23.51 sec also because acceleration of train is low.

Distance travel

d= 8.5 ( t- 4)

t= 4.81 s

d= 8.5 ( 4.81- 4)  m

d=6.88 m

Lets speed = v

0.3 t² =  v ( t- 4)

0.3 t² - v t + 4 v = 0

To have one solution

D=\sqrt{b^2-4ac}

D= 0 Should be zero.

v²- 4 x 0.3 x 4 v

v = 4 x 0.3 x 4

v=4.8 m/s

6 0
3 years ago
a force of 30 N is exerted on cart there is no friction the acceleration of the cart is 6 m/s^2 find the mass of the cart
Greeley [361]
Here we would use the equation
f = m \times a
When we sub in we would would write it as
30 = m \times 6
you would the solve the equation for an answer of 5
8 0
3 years ago
Why is it dangerous to be exposed to X-rays but not (or at least much less) dangerous to be exposed to radio waves?
love history [14]

Answer:

Short wavelength, higher energy and greater penetrating nature of x rays makes them more dangerous compared to the radio waves that have longest wavelength range and lesser penetrating power.

Explanation:

Both radio waves and x rays belong to the electromagnetic spectrum. These two types of radiation travel at the speed of light. But the frequency of the X rays is much higher compared to the radio waves. Due to this , the x rays can penetrate deeper into the skin than the radio waves.

When the wave length is smaller, they rays carry more energy, like the X rays. This makes them interact with matter more prominently. Since radio waves have longer wavelength, they carry comparatively lesser energy, making their interaction with matter lesser.

So getting exposed to x rays is more dangerous than to radio waves.

7 0
3 years ago
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