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A rocket is 80m long on the ground.when it is in flight,it's length is 99mm to an observer on the ground. Calculate it's speed(1.77×10^8m/s)
A meter stick is projected into space at so a speed that it's length appears contracted to only 50cm. How fast is it going in m/s(2.6×10^8m/s)?
A car spends through a police checkpoint at 15ms and Continues on strought rond out the same spoil. Three seconds later, a police motor cyclist at the check point starting from rest, accelerates uniformly in persuit of the car. In another 15 seconds the policeman, then travelling at Vers" and abst with the car, Signals to the driver to skup. The police an himself decelerates uniformly and stique If seconds from west instant. The car, however, trounds on at the same initial speed of 15ms for another 2 Seconds before the brakes are applied bringing the car to stop under uniform retardation in 4seconds.Calculate the value of V. this the distance between the car and the motor cylist after but have stopped
What is mechanic
P1
and
P2
are the pressure above and below the wing of an aeroplane.
ρ
is the density of air,
A
is the area of the wing and
v1
and
v2
are the speeds of air above and below the wing. Then dynamic lift of aeroplane is
Determine which of the following moving objects obeys the equations of projectile motion: (A) A ball is thrown in an arbitrary direction. (B) A jet airplane crosses the sky with its engine thrusting the plane forward. (C) A rocket leaves the launch pad. (D) A rocket moves through sky after its engines have failed. (E) A stone is thrown under water.
A mass m=2.50kg is being accelerated upwards by tension in a string. The magnitude of the acceleration a=4.00m/s2. Calculate the magnitude of the tension in the string
A man while running with the speed of 8m/s holds his umbrella vertically to protect himself , if he increases his speed by 50 percent, he has to hold his umbrella 30 degree with vertical. Find speed and direction of rain.
#339914 on Dec 2023