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kirill [66]
3 years ago
14

#2 A car accelerates from rest at 4 m/s^2. What is the velocity of the car after 4 second?

Physics
1 answer:
solmaris [256]3 years ago
3 0
You use the equation Velocity = Acceleration X Time. 4x4=16m/s.


The car travels 18m in 3 seconds.
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A relatively small impact crater 20 kilometers in diameter could be made by a comet 2 kilometers in diameter traveling at 25 km/
nadya68 [22]

Answer:

KE=1.3\times 10^{21}\ J

KE=3.1\times 10^{5}\ E

Explanation:

(a)

Given:

  • mass of comet, m=4.2\times 10^{12}\ kg
  • velocity of the comet, v=2.5\times 10^4\ m.s^{-1}

<u>Now, the kinetic energy of the comet can be given by:</u>

KE=\frac{1}{2} m.v^2

KE=0.5\times 4.2\times 10^{12}\times (2.5\times 10^4)^2

KE=1.3\times 10^{21}\ J

(b)

Given:

  • energy released by 1 megaton of TNT, E=4.2\times 10^{15}\ J

<u>Now the kinetic energy of the comet in terms of energy of 1 megaton TNT:</u>

KE=\frac{1.3\times 10^{21}}{4.2\times 10^{15}} E

i.e.

KE=3.1\times 10^{5}\ E

4 0
2 years ago
If a car is speeding up,its initial speed is ______than its final speed
Karolina [17]
Initial speed is less than final speed
5 0
3 years ago
The work output of a machine divided by the work input is the ____ of the machine.
s344n2d4d5 [400]
<span>The work output of a machine divided by the work input is the "Efficiency" of the machine.

Hope this helps!</span>
7 0
3 years ago
According to Wien's Law, how many times hotter is an object whose blackbody emission spectrum peaks in the blue, at a wave lengt
scZoUnD [109]

Answer:1.55 times

Explanation:

Given

First wavelength(\lambda _1)=450 nm

Second wavelength(\lambda _2)=700 nm

According wien's diplacement law

\lambda T=constant

where \lambda =wavelength

T=Temperature

Let T_1 and T_2 be the temperatures corresponding to \lambda _1 & \lambda _2 respectively.

\lambda _1\times T_1=\lambda _2\times T_2

\frac{T_1}{T_2}=\frac{\lambda _2}{\lambda _1}

\frac{T_1}{T_2}=\frac{700}{450}=1.55

Thus object with \lambda 450 nm is 1.55 times hotter than object with wavelength \lambda =700 nm

8 0
3 years ago
You are working as a summer intern for the Illinois Department of Natural Resources (DNR) and are assigned to some initial work
serious [3.7K]

Answer:

Check the explanation

Explanation:

1) Pressure acting on the plug = Patm + P

Pressure = Patm + rho*g*h (Here h = D2)

Pressure = 101325 + 1000*9.8*7

Pressure = 169925 Pa

so, Force = PA

Force = 169925*pi*0.0152

Force = 120.1 N

7 0
2 years ago
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