Answer:

Explanation:
When an amount of energy Q is supplied to a substance of mass m, the temperature of the substance increases by
, according to the equation

where
is the specific heat capacity of the substance.
In this problem, we have:
is the amount of heat supplied to the sample of gold
m = 0.1 kg = 100 g is the mass of the sample
is the specific heat capacity of gold
Solving for
, we find the change in temperature

And since the final temperature was

The initial temperature was

Answer:
I think B) is uncorrect
Explanation:
As A) p=w/t so it's correct relation
C) power depend on time and work as work is distance multiple force so it refer to velocity
D) the powerful mean much work in a few time
Answer:

6000
1.2 J

Explanation:
I = Current = 1 A
t = Time = 2 ms
n = Number of electrocyte
V = Voltage = 100 mV
Charge is given by

The charge flowing through the electrocytes in that amount of time is 
The maximum potential is given by

The number of electrolytes is 6000
Energy is given by

The energy released when the electric eel delivers a shock is 1.2 J
Equivalent capacitance is given by

The equivalent capacitance of all the electrocyte cells in the electric eel is 
The transformation is isobaric (constant pressure), so the work done by the gas is the product between its pressure and the variation of volume:

The heat transferred to the gas is

So we can use the first law of thermodynamics to compute the variation of internal energy of the gas:

where the positive sign means the internal energy of the gas has increased.
Answer:
The cannons total flight time is 2.23seconds
Explanation:
A ball fired diagonally is fired at an angle of 45° to the horizontal. The motion of the fired ball is a projectile motion. A projectile is a motion in which an object fired into space with an initial velocity U is allowed to fall freely under the influence of gravitational force.
To total time of flight T of the cannon ball can be expressed as;
T = 2Usin(theta)/g where;
U is the initial velocity or speed of the ball = 31m/s
theta is the angle that the ball make with the horizontal = 45°
g is the acceleration due to gravity = 9.81m/s²
Substituting the given datas into the formula we have;
T = 31sin45°/9.81
T = 31×0.7071/9.81
T = 21.92/9.81
T = 2.23seconds