plz any one help me with this:
1. A machine having a velocity ratio of 5 requires 600 J of work to raise a load of
400 N if the load moved through a distance of 0.5 m. The mechanical advantage
and efficiency of the machine are:
A. 2.5 and 33.33% respectively
B. 2.5 and 66.67% respectively
C. 1.67 and 33.33% respectively
D. 1.67 and 66.67% respectively
2. A certain first class lever of length 2.5 m has a velocity ratio of 12 and an
efficiency of 85%. Find Distance moved by effort and Force required lifting a load
weighting 75N?
A. 4.8m and 10.2 N respectively
B. 30m and 7.4 N respectively
C. 4.8m and 7.4 N respectively
D. 30m and 10.2 N respectively
3. A wheel and axle with an efficiency of 90% is to be raised a load of 10000 N. the
radius of the wheel is 40 cm while radius of the axle is 5 cm. Find Velocity ratio
and Effort
A. V.R = 8 and E = 1388.89
B. V.R = 5 and E = 1388.89
C. V.R = 8 and E = 2000
D. V.R = 5 and E = 2000
4. A car travel with uniform velocity of 30m/s for 5 second and then comes to rest
10 second with uniform deceleration.
i. Find the total distance travelled.
ii. Find the average velocity
A. Total distance is 150m and average velocity is 20m/s
B. Total distance is 300m and average velocity is 15m/s
C. Total distance is 500m and average velocity is 20m/s
D. Total distance is 300m and average velocity is 20m/s
5. We have about three equation of linear motion introduced by Sir Isaac Newton’s
in 1886, which includes the following
A. v = a + ut, s = ut + 1⁄2(at^2) & v^2 = u^2 + 2as
B. v = u + at, s = at + 1⁄2(ut^2) & v^2 = u^2 + 2as
C. v = u + at, s = ut + 1⁄2(at^2) & v^2 = u^2 + 2as
D. v = u + at, s = ut + 1⁄2(at2) & u^2 = v^2 + 2as
6. Suppose you exert an upward force of 10 N on a 3kg object. What will be the
object acceleration?
A. a = 3.33m/s2
B. a = 6.67m/s2
C. a = 30m/s2
D. a = 0.3m/s2
7. A 4kg object is moving to the right at 2m/s when it collides elastically head on
with a stationary 6kg object as after the collision, the velocity of the 6 kg object is 1.6 m/s to the right.
Find Velocity of 4kg after the collision
A. 0.4 m/s
B. 0.3 m/s
C. 0.6 m/s
D. 0.5 m/s
8. Anna has a mass of 80kg. If she runs at a speed of 10m/s. calculate her kinetic
energy
A. 8000J
B. 8J
C. 400J
D. 4000J
9. A stone of 2kg falls from a height of 25m above the ground. Calculate potential
possessed by the stone
A. 50J
B. 12.5J
C. 500J
D. 125J
10.A ball of mass 0.2kg is dropped from a height of 20m. On impact with the ground
it loses 30J of energy. Calculate the height which it reaches on the rebound
A. H= 7.5m
B. H= 5m
C. H= 50m
D. H= 75m
Answers
Answered by
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Answer:
1. B. 2.5 and 66.67% respectively
2. C. 4.8m and 7.4 N respectively
3. A. V.R = 8 and E = 1388.89
4. D. Total distance is 300m and average velocity is 20m/s
5. B. v = u + at, s = at + 1⁄2(ut^2) & v^2 = u^2 + 2as
6. B. a = 6.67m/s2
7. A. 0.4 m/s
8. A. 8000J
9. C. 500J
10. C. H= 50m
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