What is the weight (in newtons) of a bowling ball that has a mass of 3 kilograms?
2 answers:
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#1
Since Beth rode the Flying saucer ride which is spinning on its axis while axis is moving to and fro as well, so here Beth will experience two motions in this case
(i) Spinning motion
(ii) Rotational motion
#2
Jill and Scott both traveled for 30 min
So time of motion for both is 0.5 h as we know that 1 h = 60 min
Now from the formula of speed we know that
Speed of Jill
speed of Scott
so correct answer is
B) Scott had the faster speed since he rode at 20 k/h while Jill only traveled 10 km/h.
#3
Since we know that <em>acceleration is rate of change in velocity</em>
So here we can say that every motion where velocity changes with time then it is an accelerated motion.
Now change in velocity occurs when either the magnitude will change or its direction will change because here velocity is a vector quantity and it will change with magnitude and direction both.
so here due to oval path the direction of velocity will changes at many points and hence it will be an accelerated motion.
so correct answer is
<em>C) James was right since the car changed direction during the race.</em>
Answer:
Object should be placed at a distance, u = 7.8 cm
Given:
focal length of convex lens, F = 16.5 cm
magnification, m = 1.90
Solution:
Magnification of lens, m = -
where
u = object distance
v = image distance
Now,
1.90 =
v = - 1.90u
To calculate the object distance, u by lens maker formula given by:
u = 7.8 cm
Object should be placed at a distance of 7.8 cm on the axis of the lens to get virtual and enlarged image.