The correct answer is Upthrust= 0.7N and Volume = 1.02 x 10⁻² g
Solid weighs.09 N in air.
Solid weighs less than liquid because of an upward force operating on it (solid weighs in liquid =.02 N).
A solid body experiences an upthrust when it is partially or entirely submerged in a fluid, such as water. In this case, the fluid's weight (water) equals the fluid's weight that the water has displaced.
upthrust is = to.09 -.02 N = 0.7N.
Upthrust = displaced liquid's weight
so that weight of liquid equal to volume of solid = 0.7 N
Volume of solid times mass of liquid = 0.07/9.8 = 0.00714 = 7.14 x 10⁻³ kg
Volume = Mass / density
Volume = 7.14 x 10⁻³ / 700
= 1.02 x 10⁻⁵ kg= 1.02 x 10⁻² g
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Answer : The height is 188 meters
Explanation : When the cart reached at the end from top of hill then the cart have potential energy .
Given that,
Potential energy = 88435 J
Mass of cart = 48 kg
We know that,
The potential energy is
So, the height of the top is 188 meters.
Answer:
Explanation:
1 ) Force F = dp/ dt , p is momentum
= d/dt (mv)
= v dm/dt
Given dm/dt = 0.1 kg per second.
Force = v x 0.1
= .1 x .1
= .01 N
2 ) work done = force x displacement
Displacement in 1 s = 0. 1 m ( v = .1 m /s )
Work done in one second = .1 X .1
= .01 J
3 ) Velocity is constant so change in kinetic energy is due to additional mass .
Mass deposited in one second
= .1 g
Velocity = .1 m/s
Change in kinetic energy = 1/2 x .1 x .1 ²
= 5 x 10⁻⁴J
4 ) No , they are not the same. It is so because force has to do work against the frictional force offered by the surface on which sand is falling . So rise in kinetic energy is small as compared with work done by the force.
Answer:
-0.4 m/s
Explanation:
We can solve this problem by using the law of conservation of momentum. In fact, the total momentum of the shell + cannon system must be conserved.
Before the shot, the total momentum of the system is zero:
p = 0
After the shot, the total momentum is:
where
m = 3.0 kg is the mass of the shell
v = 200 m/s is the velocity of the shell
M = 1500 kg is the mass of the cannon
V is the recoil velocity of the cannon
Since momentum is conserved, the initial and final momenta must be equal, therefore:
Where the negative sign indicates that the cannon moves in the opposite direction to the shell.
Answer:
Explanation:
Potential Energy= Kinetic Energy
Let be the value of Kinetic Energy.
We know that
Make the subject of the formula to get speed at the bottom of the hill.