Answer:
All matter contained electrons
Explanation:
The discovery and characterization of cathode ray suggested that it was a subatomic particle and cathode ray ( electron) was the first discovered. It immensely became the strong explanatory tool for chemical bond. This can be attributed to the the ease with which electron move from one atom to the other.
Answer:
c. Equal to the weight of the block.
Explanation:
We know that when an object floats , the displaced water by the floating body
has weight equal to the weight of the body . In this condition the upthrust becomes equal to the weight of the body .
In the present case the beaker is full to the brim with water . Then the body was made to float into it . While attaining equilibrium in water , it displaces water whose weight must have been equal to its weight . That liquid got spilled over the edge and collected on the tray .
So water collected on the tray must be equal to the weight of the body floating.
Force = (mass) x (acceleration)
= (2 kg) x (20 m/s²) = 40 newtons .
about 9 pounds .
Note: The ball can only accelerate during the short time
that the clubface is in contact with it. Once it leaves the
clubface, it can't accelerate any more.
Also ... that's one heckuva golf ball. It weighs about 4.4 pounds !
Answer:
The toy's energy is 18 J.
Explanation:
We have, a 4 kg toy is lifted off the ground and falls at 3 m/s. It is required to find toy's energy.
The toy will have kinetic energy due to its motion. The energy is given by :
![E=\dfrac{1}{2}mv^2\\\\E=\dfrac{1}{2}\times 4\times 3^2\\\\E=18\ J](https://tex.z-dn.net/?f=E%3D%5Cdfrac%7B1%7D%7B2%7Dmv%5E2%5C%5C%5C%5CE%3D%5Cdfrac%7B1%7D%7B2%7D%5Ctimes%204%5Ctimes%203%5E2%5C%5C%5C%5CE%3D18%5C%20J)
So, the toy's energy is 18 J.
here we need to find the components of given force
given that 310 N force is at angle 55 degree
now the components of force will be
![F_x = 310 cos55 = 177.8 N](https://tex.z-dn.net/?f=F_x%20%3D%20310%20cos55%20%3D%20177.8%20N)
![F_y = 310 sin55 = 253.94 N](https://tex.z-dn.net/?f=F_y%20%3D%20310%20sin55%20%3D%20253.94%20N)
so the force that makes it difficult to move is perpendicular force
it is
F = 253.94 N