the missing force is spring force.
The object is hanging from the spring and the spring is stretched by some distance from its equilibrium position. due to this stretch in the spring , a spring force starts acting on the object trying to regain its equilibrium position.
the spring force is given as
F = kx
where F = spring force ,k = spring constant , x = stretch in the spring.
the spring force balances the weight of the object in down direction and hence keeps the block from falling down.
Answer:
20 J
Explanation:
as volume remains constant hence work done is zero
internal energy = heat given to system -work done by system
= 20 J -0
= 20 J
Answer:
momentum of elephant will be more than the momentum of mouse
Explanation:
As we know that momentum is the product of mass and velocity
so we can write it as
here we know that a mouse is moving with speed 1 m/s
let say mass of mouse is m1 so we have
similarly now we know that elephant is moving with speed 3 m/s
now let say the mass of elephant is of mass m2 so
now we know that mass of elephant as well as speed of elephant both are more than mouse
so momentum of elephant will be more than the momentum of mouse
Because of friction, net work on the crate is less. ∆KE = Net work = net force x distance = (100 N – 70 N)(10 m) = 300 J.
Answer is C. Kelvin, Kelvin is the temperature scales does water boil at the highest numerical value. Hope it helped you, and have a great day.
-Charlie