Kinematics [NEET (2024 Updated)-National Eligibility cum Entrance Test (Medical) Physics]: Questions 216 - 219 of 475
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Question 216
Question MCQ▾
A ball of mass m hits a wall with a speed v making an angle 6 with the normal. If the coefficient of restitution is e, the direction and magnitude of the velocity of ball after reflection from the wall will respectively be –
Choices
Choice (4) | Response | |
---|---|---|
a. | , | |
b. | , | |
c. | , | |
d. | , |
Question 217
Question MCQ▾
The mass of a rocket is 600 kg and the relative velocity of the gases ejecting from it is 250 m/s with respect to the rocket. The rate of burning of the fuel in order to give the rocket an initial acceleration 40 m/s2 in the vertically upward direction (g = 10 m/s2) , will be –
Choices
Choice (4) | Response | |
---|---|---|
a. | 72 kg/s | |
b. | 10 kg/s | |
c. | 60 kg/s | |
d. | 120 kg/s |
Question 218
Question MCQ▾
A rifle man, who together with his rifle has a mass of 100 kg, stands on a smooth surface fires 10 shots horizontally. Each bullet has a mass 10 gm and a muzzle velocity of 600 m/s. What velocity does rifle man acquire at the end of 10 shots.
Choices
Choice (4) | Response | |
---|---|---|
a. | 0.3 m/s | |
b. | 0.5 m/s | |
c. | 0.6 m/s | |
d. | 1.2 m/s |
Question 219
Question MCQ▾
A force produces an acceleration of 10 m/s2 in a body and same force an acceleration of 25 m/s2 in another body. The acceleration produced by the same force when applied to the combination of two bodies will be –
Choices
Choice (4) | Response | |
---|---|---|
a. | 7.142 m/s2 | |
b. | 3.75 m/s2 | |
c. | 20 m/s2 | |
d. | 0.667 m/s2 |