Answer:
Explanation:
Given
mass of projectile 
initial horizontal speed 
height 
Considering vertical motion
velocity gained by projectile during 26.7 m motion

v=final velocity
u=initial velocity
a=acceleration
s=displacement



Horizontal velocity will remain same as there is no acceleration
final velocity 

Initial kinetic Energy 

Final Kinetic Energy 


Work done by all the force is equal to change in kinetic Energy of object
Work done by gravity is 

Answer:
Number of electrons, n = 395.47
Explanation:
It is given that,
Force between two spheres, 
Distance between spheres, r = 35 cm = 0.35 m
A force of repulsion is acting on the spheres. It is given by :





Let n is the number of electrons on the spheres. So,
q = n e


n = 395.47
So, the the number of excess electrons on the spheres are 395.47. Hence, this is the required solution.
<span>As a cold front arrives, you are, most likely in the warm sector of the frontal low pressure. You could say that the air will be warmer than after the passing of the front.</span>
Hello,
<span>A police car parked on the side of the highway emits a 1200 Hz sound that bounces off a vehicle farther down the highway and returns with a frequency of 1250 Hz.
How fast is the vehicle going?
Doppler equation formula: </span>ƒL = ƒS(v - vL)/(v - vS)
The wave returns with a frequency of 1250 Hz, the <span>echo frequency is higher; the car must be traveling towards the police car.
</span><span>The wave echo is coming back towards the police car at the same speed as the sound wave travels towards the moving car so t</span><span>he relative speed between the cars is half of the speed of the echo.
* </span><span>speed of sound equals about 337 m/s </span>
2v / 337 = (1250/1200) - 1
<span>2v = 14.04 m/s </span>
<span>v = 7.02 m/s
</span>
Thus, the vehicle is going 7.02 m/s.
Faith xoxo
Answer:
7.7 GJ
Explanation:
Kinetic wnergy is given by
KE=½mv²
Where KE denote kinetic energy, m is the mass of object and v is velocity. Normally, m is in Kg and v in m/s
Conversion
Given speed of satelite in km/h, we convert it into m/s by multiply by 1000/3600
20000*1000/3600=5555.5555555555
Rounded off, m=5555.56 m/s
Substituting 500 kg for m and 5555.56 m/s for v then
KE=½*500*5555.56²=7,716,061,728.4 rounded off as
KE=7.7 GJ