The next step to take is to used the scientific method to explore the observations she has made in order to discover the facts behind her observations. She should ask questions about the hotness of the pavement and form an hypothesis to support her observation. She should then set up an appropriate experiment to confirm her hypothesis. After the conduction of the experiment, she should analyze her results and then draw a conclusion.<span />
Answer:
The final temperature is 85.86°C.
Explanation:
Given that,
Mass of tea = 200 g
Mass of glass = 150 g
Initial temperature = 25°C
We need to calculate the final temperature
When equilibrium is reached, assuming no heat flows to the surroundings
So,
We know that,
Specific heat of tea = 1.00 cal/gm° C
Specific heat of tea = 0.20 cal/gm° C
Put the value into the formula
Put the value of initial temperature
Hence, The final temperature is 85.86°C.
Explanation:
Given data
Velocity v=3 m/s
Water volume flow rate V=590 m³/s
Water elevation z=90 m
Water density p=1000 kg/m³
First we need to determine the energy per unit mass
So
Now the power generation potential is:
-- The net effective resistance of three 1200-ohm resistors in
parallel is (1200/3) = 400 ohms. That's what the battery sees.
-- Power = (voltage)² / (resistance)
= (12²) / (400)
= 144 / 400
= 0.36 watt .
There's no such thing as "power in the circuit".
0.36 watt is the power dissipated by the resistors.
It's the rate at which the battery must supply energy,
and the rate at which the resistors blow it off in the form
of heat, for as long as the battery lasts.
Answer:
58.32 N
Explanation:
Area of a circle =
where r is the radius of the circle.
The cylinder has a radius of 0.02 m, its area is;
=
= x
= x 0.0004
= 1.2571 x
Area of the cylinder is 0.0013 .
The safety valve has a radius of 0.0075 m, its area is;
=
= x
= x 5.625 x
= 1.7679 x
Area of the valve is 0.00018 .
From Hooke's law, the force on the safety valve can be determined by;
F = ke
= 950 x 0.0085
= 8.075 N
Minimum force, , required can be determined by;
=
=
=
= 58.32
The minimum force that must be exerted on the piston is 58.32 N.