Radio waves are the waves with the lowest energy in the electromagnetic spectrum. X-rays and gamma rays are the highest. Sound is not part of the electromagnetic spectrum.
Answer:
4200 kJ
10 kg/min
Explanation:
70 kW means 70 kJ per second. So in a minute, the amount of heat generated at the brake is:
70 kJ/s × 60 s/min = 4200 kJ
Heat = mass × specific heat capacity × increase in temperature
4200 kJ = m × 4.184 kJ/kg/C × 100 C
m = 10 kg
So every minute, 10 kg of water is heated. So the mass flow is 10 kg/min.
Answer:
6010.457N
Explanation:
Centripetal acceleration = a= V²/R
At a radius of 3.6m and velocity of 16.12m/s,
Acceleration is
a = 16.12²/ 3.6 = 72.182 m/s²
Force = Mass (m) * Acceleration (a)
36 = m * 72.182
m = 36/72.182
At breaking point
Radius = 0.468 m and Velocity = 75.1 m/s
a = V²/R = 75.1²/0.468
a = 12051.3 m/s
F = Mass(m) * Acceleration (a)
F = m * 12051.3
m = F/ 12051.3
Settings the ratio of mass equal
m = m
=> 36/72.182 = F/12051.3
F = 12051.3 * 36/72.182
F = 6010.457N
The forces are unbalanced because Jasper weighs more than Gemma
The side that Gemma is on will only move upwards if the force exerted on the other side is greater than the force exerted by Gemma. In this case, force is referring to the weight of the children. Therefore, in order for Gemma to go upwards, Jasper must weigh more than her.
Answer:
60 sec
3.6 Km
Explanation:
Given that the truck is going at a speed of 36 km/hr = 
= 10 m/sec
Given that the car starts at a point 3km=3000 m behind the truck
Initial velocity (u) of the car = 0 m/sec
Acceleration (a) of the car = 2 m/
We know when they meet let the distance travelled by the truck be d Then the distance travelled by the car is d + 3000
For truck
d = 10t
For car
d+3000 = 
10t + 3000 = 
On solving we get t = 60 sec
The car will overtake the truck at 60 sec
The distance travelled by car is = 3600 m= 3.6 Km
