Answer:
h = 10 cm
Explanation:
The magnification produced by a mirror is given by :
h' is the image size and h is the object size
We have, h = 10 cm, m = +1
So,
So, the size off the object is same as that of the size of the image i.e. 10 cm.
Polly is pushing a box across the floor with a force of 30 n. the force of gravity is –8 n, and the normal force is 8 n. which v
2 answers:
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Answer:
(a) 508.37 m
(b) 47.53 s
(c) 21.165 m
(d) 19.365 m
Explanation:
initial velocity, u = 77 km/h = 21.39 m/s
acceleration, a = - 0.45 m/s^2
(a) final velocity, v = 0
Let the distance traveled is s.
Use third equation of motion
s = 508.37 m
(b) Let t be the time taken to stop.
Use first equation of motion
v = u + at
0 = 21.39 - 0.45 t
t = 47.53 s
(c) Use the formula for the distance traveled in nth second
where n be the number of second, a be the acceleration, u be the initial velocity.
put n = 1, u = 21.39 m/s , a = - 0.45m/s^2
(d) Use the formula for the distance traveled in nth second
where n be the number of second, a be the acceleration, u be the initial velocity.
put n = 5, u = 21.39 m/s , a = - 0.45m/s^2