Answer:
100,800 Jkg
The heat that is used to change the state of a mater is called latent heat.
In this case it is converting ice to water and it is called latent heat of fusion.
It is given by:
Heat = mc
where m is the mass of ice and l is the specific latent heat of fusion of ice.
l = 0.336 MJ
Heat = 0.3 × 0.336 MJ
= 0.3 × 0.336 × 10⁶
= 100,800 Jkg
Answer:
A. 64.0 J
Explanation:
Given parameters:
Spring constant = 800N/m
Extension = 0.4m
Unknown:
Work done = ?
Solution:
The work done in a string is given as:
Work done = 
x 800 x 0.4² = 64J
Since the plane is traveling at 100m/s horizontal to the surface of the earth, the crate will always have this horizontal velocity (neglecting air resistance) until it hits the ground. So the answer is 100m/s. Note the vertical speed continues to change as the crate accelerates downward toward earth (again neglecting air effects)
Yep. I think I can.
Horizontal motion doesn't speed up or slow down.
distance = (speed) x (time)
5.4 m = (3.5 m/s) x (time)
Divide each side
by 3.5 m/s: (5.4 m) / (3.5 m/s) = time
time = 1.543 seconds (rounded) .
That's how much time the stone took to fall from the bridge to the water.
Now we can go on to the vertical distance:
Do you remember this physics formula for falling distance ?
Distance = (1/2) (gravity) (time)²
Distance = (1/2) (9.8 m/s²) (1.543 sec)²
= (4.9 m/s²) x (2.38 sec²)
= 11.7 meters .
