The velocity of the car was measured by a traffic police through his radar gun at that instant. The gun measured
A) Instantaneous acceleration
B) Instantaneous velocity
C) Average acceleration
D) Average velocity
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A car is moving towards east with a speed of `25 km h^-1`. To the driver of the car, a bus appears to move towards north with a speed of `25 sqrt(3) k
Correct Answer - 50 km/h`(60^(@)N" of "E)`
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A shell of mass 0.020 kg is fired by a gun of mass 100 kg. If the muzzle speed of the shell is 80 m s^-1, what is the recoil speed of the gun?
Given: m1 = 0.02 kg, m2 = 100 kg, v1 = 80 m s-1 To find: Recoil speed (v2) Formula: m1u1 + m2u2 = m1v1 + m2v2 Calculation: Initially gun and shell are at rest. ∴ m1u1 + m2u2 = 0 Final momentum =...
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A man observes a car from the top of a tower, which is moving towards the tower with a uniform speed. If the angle of depression of the car change fro
Correct Answer - `473.2 m`
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A bullet of mass 10 g is fired from a gun of mass 1 kg with recoil velocity of gun = 5 m/s. The muzzle velocity will be
Correct option is: (D) 500 m/s Using conservation of linear momentum. \(m_1 \ v_1 = m_2 \ v_2\) \(v_1 = \frac{m_2 \ \times \ v_2}{m_1}\) \(v_1 = \frac{1 \times 5}{10 \times 10^{-3}}\) \(v_1 = \frac{5000}{10}\) \(v_1 =...
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A bullet of mass 10 g is fired from a gun of mass 1 kg with recoil velocity of gun = 5 m/s. The muzzle velocity will be
2 Answers
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If the speedometer of a car indicates a constant reading, then the car is in
A) uniform motion
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Explain the term ‘Radar’. Write down the importance of radar in an aircraft.
Radar is an object detection system that uses radio waves to determine the range, altitude, direction, or speed of objects. It can be used to detect aircraft, ships, spacecraft, guided...
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A car covers half the distance at a speed of 60 kmh^(-1) and the other half at a speed of 40 km h^(-1) The average speed of the car is
Correct option is B) 50 km h-1
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We can push a bicycle easily, then a car because, A) mass of the bicycle > mass of the car
B) mass of the car > mass of the bicycle
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If a car travels 60 kmph then it reaches the destination in 4 hours. If the car travels at 80 kmph then the time taken by car is ………………. hrs
Correct option is (D) 3 Distance covered by car by travelling 60 kmph in 4 hours = speed \(\times\) time \(=60\times4\) = 240 km When car travels at 80 kmph then time by the car \(=\frac{Distance}{Speed}\) \(=\frac{240}{80}\) =...
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