Answer:
60,000 kgm/s
Explanation:
momentum equation,
momentum = mass × velocity.
mass = 2000kg
velocity = 30m/s
when multipled you get = 60,000 kgm/s
hope it helps. :)
I think that when work is done and a force istransferred an object must move in the direction of the force.
Answer:
t = 5 hr
Explanation:
Let kali moves toward east with velocity= V₁= 40 km/ h
Mat moves toward west with velocity = V₂= 50 km/hr
As Klai left one hour earlier = t₁= 1 hr
distance traveled in 1st hour = s₁ = v * t = 40 * 1 = 40 km
Remaining distance = 400 - 40 = 360 km
As they move in the opposite directions:
Relative speed= 40 + 50 = 90 km/ h
s = v * t
⇒ t = s / v
⇒ t₂ = 360 / 90
⇒ t₂ = 4 hr
Total time = t = t₁ + t₂
t = 1 hr + 4 hr
t = 5 hr
Answer:
599 N/m
Explanation:
Let k (N/m) be the spring constant. According to the law of energy conservation, the total mechanical energy (kinetic and elastic) any any point along the spring must be the same:
![kx^2/2 + mv^2/2 = constant](https://tex.z-dn.net/?f=kx%5E2%2F2%20%2B%20mv%5E2%2F2%20%3D%20constant)
![k0.12^2/2 + 0.73*7.2^2/2 = k0.23^2/2 + 0.73*4.5^2/2](https://tex.z-dn.net/?f=k0.12%5E2%2F2%20%2B%200.73%2A7.2%5E2%2F2%20%3D%20k0.23%5E2%2F2%20%2B%200.73%2A4.5%5E2%2F2)
![0.0144k + 37.8432 = 0.0529k + 14.7825](https://tex.z-dn.net/?f=0.0144k%20%2B%2037.8432%20%3D%200.0529k%20%2B%2014.7825)
![0.0385k = 23.0607](https://tex.z-dn.net/?f=0.0385k%20%3D%2023.0607)
![k = 599 N/m](https://tex.z-dn.net/?f=k%20%3D%20599%20N%2Fm)
A 40-gallon gas water heater can recover in about an hour. But a Recovery for a 40-gallon electric water heater takes about two hours.But I'm not so sure about a water tank