Answer:
Q = 0.75 g x 0.897 J/g•°C x 22°C
Explanation:
The amount of heat needed to raise the temperature of a substance is given by the equation
where
m is the mass of the substance
C is the specific heat capacity
is the increase in temperature of the substance
In this problem, the mass of the aluminium is m=0.75 g. The specific heat of aluminium is C=0.897 J/g•°C, while the increase in temperature is
So, the equation becomes
Q = 0.75 g x 0.897 J/g•°C x 22°C
Answer:
Explanation:
For discharge of capacitor in RC circuit , the relation is as follows
V is voltage across the capacitor , V₀ is maximum voltage across capacitor , λ is time constant and t is the time after which the voltage is recorded. During discharge this will also be voltage across resistance .
Taking log on both sides
lnV = lnV₀ - 
Given equation
[lnV] = - .027 t + 2.5
Comparing these equation
λ = 37 s
time constant = 37 sec.
Explanation:
Weight=force=300N
height=2m
time=6seconds
power=?
now,
power (p)=f×h÷t
power=300×2÷6
power=100w
therefore,A man develops 100 watt power in 6 seconds.
None of these is a Physics problem. The numbers, and the fractions that
they appear in, might have come from Physics problems, but these are
nothing more than arithmetic exercises, and they can be whipped out
in a hurry with a little bit of fancy calculator work. You don't have to
know any Physics in order to answer any of these.
The first one is 2.7 x 10⁻²⁴ Newton.
Answer:
471392.4 N
Explanation:
From the question,
Just before contact with the beam,
mgh = Fd.................... Equation 1
Where m = mass of the beam, g = acceleration due to gravity, h = height. F = average Force on the beam, d = distance.
make f the subject of the equation
F = mgh/d................ Equation 2
Given: m = 1900 kg, h = 4 m, d = 15.8 = 0.158 m
Constant: g = 9.8 m/s²
Substitute into equation 2
F = 1900(4)(9.8)/0.158
F = 471392.4 N
