Let's think about the system that includes the spacecraft, the astronaut,
and all the equipment tied to him. In this system, nothing is moving relative
to anything else, so the total linear momentum is zero.
Now, suddenly, a blast of gas leaves the astronaut's little SCUBA tank, and
hisses away from him and the spacecraft, in that direction ===> .
The momentum of the cloud of nitrogen is
(mass) x (speed)
= (0.03 kg) x (900 m/s)
= 27 kg-m/s in that direction ===> .
Now is the perfect time to recall that momentum is conserved.
It can't be suddenly created or destroyed, it can't appear out of
nowhere, it can't disappear into nowhere, and the total amount
of momentum in a system is constant.
In order to keep the total momentum of this system constant, the
astronaut himself gets 27 kg-m/s of momentum in this direction <=== .
The mass of him and his equipment is 320 kg.
So ...
27 kg-m/s <== = (320 kg) x (speed <==)
Speed = 27 kg-m/s / 320 kg
= 0.084375 m/s in this direction <===
Answer:
The moon rotates, just like Earth! We only see one side of the Moon from Earth because the Moon rotates on its axis at the same rate that the Moon orbits the Earth – this process is called synchronous rotation, or tidal locking. Hope this helps!
Explanation:
To solve this problem we will apply the concepts of Boiling Point elevation and Freezing Point Depression. The mathematical expression that allows us to find the temperature range in which these phenomena occur is given by
Boiling Point Elevation
Here,
= Constant ( Different for each solvent)
m = Molality
Freezing Point Depression
Here,
Constant ( Different for each solvent)
m = Molality
According to the statement we have that
From the two previous relation we can find the ratio between them, therefore
We already know the change in the freezing point, then
The temperature difference in the boiling point is 100°C (Aqueous solution), therefore
Therefore the boiling point of an aqueous solution is
Answer:
The surface temperature of the brake shoe and drum is 95°C.
Explanation:
Given that,
Rate of heat = 75 W
Surface area = 0.1 m²
Heat transfer coefficient = 10 W/m²
Temperature = 20°C
We need to calculate the surface temperature of the brake shoe and drum
Using equation of heat
Put the value into the formula
Hence, The surface temperature of the brake shoe and drum is 95°C.
Answer:
Yes
Explanation:
if it's staying at 5mph and cruising at that speed it's constant speed