The amount of heat needed is 338 J
Explanation:
When a substance is at its melting point, the amount of heat required in order to completely melt the substance is given by the equation:
where:
m is the mass of the substance
is the specific latent heat of fusion of the substance
In this problem, we have:
m = 5.24 g is the mass of gold
is the specific latent heat of gold
The sample of gold is already at its melting point, , therefore the amount of heat needed to melt it is:
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Answer:
An object with negative acceleration could be speeding up, and an object with positive acceleration could be slowing down. ... Consider the fact that acceleration is a vector that points in the same direction as the change in velocity.
Explanation:
It can't. Acceleration IS a change in velocity.
If you say x = distance from pole to the woman and z = distance from the pole to the tip of her shadow, from similar triangles, you can write:
z/16 = (z-x)/6. (1)
We also know that the woman is moving at 7 feet/second or dx/dt = 7
You need to find dz/dt when x = 45. When you differentiate equation (1) with respect to t, you get:
(1/16)*dz/dt = (1/6)(dz/dt - dx/dt), or
6*dz/dt = 16(dz/dt - dx/dt), or 10*dz/dt = 16*dx/dt or dz/dt = 1.6*dx/dt
which means the distance 45 does not enter into the equation.
Plug dx/dt = 7, you get dz/dt = 1.6*7 = 11.2 feet/sec.
Answer:
i would say either more or the same
Explanation: