Answer:
V = 0.05 m^3
Explanation:
The weight of the object of mass (m) and volume (V) in water is: 275 N and it is calculated using the buoyancy formula:
275 N = m g - V (dw) g
where (dw) is the density of water (1000 kg/m^3)
The weight of the object in oil is 325 N and it is calculated using the buoyancy formula as:
325 N = m g - V (do) g
where "do" is the density of oil which is: 0.9 x 1000 kg/m^3 = 900 kg/m^3
Therefore, subtracting term by term the two equations:
325 N -275 N = mg - mg - V (do) g + V (dw) g
50 N = V g (dw - do)
50 N = V g (1000 - 900)
50 N = V g (100)
solving for V (which will result in units of m^3):
V = 50 / 981 m^3
V = 0.05 m^3
Answer:
F = 4000 N
Explanation:
given,
mass of rocket (M)= 5000 Kg
10 Kg gas burns at speed (m)= 4000 m/s
time = 10 s
average force = ?
at the end the rocket is at rest
by conservation of momentum
M v + m v' = 0
5000 x v - 10 x 4000 = 0
5000 v = 40000
v = 8 m/s
speed of rocket = 8 m/s
now,
we know
change in momentum = F x Δ t
![F = \dfrac{m(v_i-v_f)}{\Delta t}](https://tex.z-dn.net/?f=F%20%3D%20%5Cdfrac%7Bm%28v_i-v_f%29%7D%7B%5CDelta%20t%7D)
![F = \dfrac{5000(8-0)}{10}](https://tex.z-dn.net/?f=F%20%3D%20%5Cdfrac%7B5000%288-0%29%7D%7B10%7D)
F = 4000 N
Hence, the average force applied to the rocket is equal to F = 4000 N
Answer:
Distance, S = 15m
Explanation:
Given the following data;
Mass = 4kg
Force = 10N
Initial velocity = 5m/s
Final velocity = 10m/s
To find the distance;
First of all, we would calculate the acceleration
Force = mass * acceleration
10 = 4*acceleration
Acceleration = 10/4
Acceleration = 2.5m/s²
Now to find the distance, we would use the third equation of motion.
Where;
- V represents the final velocity measured in meter per seconds.
- U represents the initial velocity measured in meter per seconds.
- a represents acceleration measured in meters per seconds square.
S represents the displacement measured in meters.
Substituting into the equation, we have;
10² = 5² + 2*2.5*S
100 = 25 + 5S
5S = 100 - 25
5S = 75
Distance, S = 75/5
Distance, S = 15m
Answer:
With a slower speed-perhaps 5 cm/s answer is c
The first energy level can be occupied by a maximum of 2 electrons.
Each hydrogen atom has only one electron which occupies the first energy level.
Therefore, two hydrogen atoms will each share this one electron and form a covalent bond. By doing this (sharing electron), each of the two atoms will now be having 2 electrons (its original electron + the shared one from the other atom) and are now both stable forming a hydrogen molecule.