Answer:
When put into steam
Explanation:
When a certain amount of steam at boiling temperature condenses (turning into water), the amount of heat released is
where in this case
m = 25.0 g = 0.025 kg is the mass of steam at 100.0°C
is the latent heat of vaporization of water
So,
Instead, the amount of heat released when the water at 100.0°C is cooled down to 34.0°C is given by
where
m = 25.0 g = 0.025 kg is the mass of water
is the specific heat of water
is the change in temperature
Therefore,
Since 
, we can say that your hand will burn more in the first case.
Answer:
The range of the projectile is 66.7 meters.
Explanation:
The range of a projectile is given by the following expression as :
..............(1)
The range can be calculated using equation (1). Putting the values of all parameters we get :
R = 66.7 meters
So, the range of the projectile is 66.7 meters. Hence, this is the required solution.
The force of Earth's gravity on you is greatest when you stand as
close as you can to the center of the Earth (but not underground).
From the choices listed, that would be (c).
Answer:
t = 300 seconds
Explanation:
Given that,
The power output of the motor, P = 1.5 kW
Energy transferred = 450 000 J
Power is given by work done per unit time. So,
So, it will take 300 seconds for the motor.
Answer:
3.6m/s
Explanation:
The following data were obtained from the question:
Mass (m) = 0.5Kg
Spring constant (K) = 330N/m
Energy = 3.24J
Velocity (v) =..?
The velocity of the mass can be obtained as follow:
E = ½mv²
3.24 = ½ × 0.5 × v²
3.24 = 0.25 × v²
Divide both side by 0.25
v² = 3.24/0.25
Take the square root of both side
v = √(3.24/0.25)
v = 3.6m/s
Therefore, the speed of the mass is 3.6m/s
