Answer:
Motion with constant velocity of magnitude 1 m/s (uniform motion) for 4 seconds in a positive direction and then for 2 seconds uniform motion with constant velocity of magnitude 3 m/s in reverse direction .
Explanation:
The graph shows a constant velocity of 1 m/s for 4 seconds in the positive direction. After that, between 4 seconds and 6 seconds, the object reverses its motion with constant velocity of magnitude 3m/s.
One common reason why it is important is so you could properly measure the length or width of a wooden log another reason is how you could measure how tall somebody is in centimeters or feet. Hope this helped give me brainliest please
Answer:
a) 
b) 
Explanation:
Given:
- efficiency of the motor,
- voltage of the battery,
- mass of the car,
a)
initial velocity, 
final velocity, 
time taken for the acceleration, 
Now we know by the Newton's second law of motion:
Now the power will be :
<u>According to the question:</u>
0.95 times of the electrical power should yield this mechanical power.
b)
height climbed by the car, 
velocity of climb,
time taken to climb the height, 
force exerted to overcome air and frictional resistances, 
Now the Power required to climb the hill:
<u>Now according to the electrical efficiency:</u>
Answer: A
Explanation: We know that f=p*n
f=50*300=15000 Hz = 15kHz.
Have a great day! <3
Answer:
4.39 x 10^-19 J
Explanation:
q1 = 1.6 x 10^-19 C
q2 = - 1.6 x 10^-19 C
r1 = 3 x 10^-10 m
r2 = 7 x 10^-10 m
The formula for the potential energy is given by
U1 = k q1 q2 / r1 = - (9 x 10^9 x 1.6 x 10^-19 x 1.6 x 10^-19) / (3 x 10^-10)
U1 = - 7.68 x 10^-19 J
U2 = k q1 q2 / r2 = - (9 x 10^9 x 1.6 x 10^-19 x 1.6 x 10^-19) / (7 x 10^-10)
U2 = - 3.29 x 10^-19 J
Change in potential energy is
U2 - U1 = - 3.29 x 10^-19 + 7.68 x 10^-19 = 4.39 x 10^-19 J
