A stone thrown horizontally from a height of 5.72 m hits the ground at a distance of 13.30 m. Calculate the initial speed of the
1 answer:
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Answer:
1250
Explanation:
Let's look at this in a simple manner, because it is.
The crane weights 250Kg. Okay.
Since it is hung, there is the acceleration of gravity being applied on it (10m/s²)
Since F = m * a
F = 250 * 10
F = 2500
Now we know that the downward Force is 2500N.
To find the force that is being applied on that 30° angle, we can multiply our 2500N by cos30°, which happens to be .
Therefore, the force pulling the box in the cable's direction is:
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Answer:
Ratio of resistance of heater A to resistance of heater B is 5.80
Explanation:
Consider C be the specific heat of water, R₁ and R₂ be the resistance of heater A and heater B respectively.
Given:
Mass of water in heater A, m₁ = 1 L
Mass of water in heater B, m₂ = 5.80 L
Initial temperature, T₀ = 20 ⁰C
Final temperature, T₁ = 90 ⁰C
Time, t = 5 min
Amount of heat required to raise the temperature of water by heaters A and B are given by:
Q₁ = m₁C(T₁ - T₀) and
Q₂ = m₂C(T₁ - T₀)
Ratio of power used by both the heaters A and B is:
Since, time t, temperature difference(T₁ - T₀) and specific heat C are same for both the heaters A and B. So, the above equation becomes:
...(1)
The relation to determine electrical power for both heaters A and B are:
and
Here V is the voltage applied to both the heaters and is equal.
So, the ratio of electrical power of heaters is:
....(2)
But according to the problem, the electrical power is converted into the thermal power. So,equation (1) and (2) are equal. Hence,
Substitute the suitable values in the above equation.