The mass of the block is 920 kg.
The angle of inclination of the slope with respect to the plane is 30 degree.
The initial speed of the block [u] =50 cm/s
=50×0.01 m/s
=0.5 m/s
The block is once pushed and it moves downward on the slope. The distance of the block from the bottom is 2.3 m .
Hence the distance travelled by the block [s]=2.3 m
We are asked to calculate the final velocity of the block when it touches the ground.
First we have to calculate the acceleration of the block.
Resolving g into horizontal and vertical component we get,
![[1] gsin\theta\ is\ along\ the\ slope\ and\ downward](https://tex.z-dn.net/?f=%5B1%5D%20gsin%5Ctheta%5C%20is%5C%20along%5C%20the%5C%20slope%5C%20and%5C%20downward)
![[2] gcos\theta\ is\ along\ the\ normal\ drawn\ to\ the\ block](https://tex.z-dn.net/?f=%5B2%5D%20gcos%5Ctheta%5C%20is%5C%20along%5C%20the%5C%20normal%5C%20drawn%5C%20to%5C%20the%5C%20block)
Now putting the equation of kinematics we get-
Here v is called final velocity and a is the acceleration.
![=[0.5]^2+2*gsin\theta *2.3](https://tex.z-dn.net/?f=%3D%5B0.5%5D%5E2%2B2%2Agsin%5Ctheta%20%2A2.3)
![=0.25+[2*9.8*0.5*2.3]](https://tex.z-dn.net/?f=%3D0.25%2B%5B2%2A9.8%2A0.5%2A2.3%5D)
[sin30=0.5]
[ans]
Answer:
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it is c
Explanation:
<span>Newton's first law of Motion is often referred to as the "Law of Inertia."</span>
Answer:
a. Stars all warm objects
c. Some unstable atomic nuclei
Explanation:
Gamma rays are photons of very high energy (beyond 100keV) enough to remove an electron from its orbit.
They have a very short wavelength, less than 5 meters from the peak, and can be produced by nuclear decay, especially in the breasts of massive stars at the end of life.
They were discovered by the French chemist Paul Villard (1860 to 1934).
While X-rays are produced by electronic transitions in general caused by the collision of an electron with an atom at high speed, gamma rays are produced by nuclear transitions.
Gamma rays produce damage similar to those caused by X-rays or ultraviolet rays (burns, cancer and genetic mutations).
The sources of gamma rays that we observe in the universe come from <u>massive stars (hypernovas) or some warm objects on the space</u> that end their lives by a gravitational collapse that leads to the formation of a neutron star or a black hole, as well as <u>unstable radioactive nuclei </u>that emit radiation gamma to reach its steady state.
Wavelength and frequency have a reciprocal relationship. If one doubles, the other halves.
