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A object was fired at 17meters per second at a 40 degree and traveled 29 meters how long was it in the air
A 2500 kg truck travelling at 40 km/h strikes a brick wall and comes to a stop in 0.2 s. a. What is the change in momentum? (Ans. – 2.78 x 10^4 kgm/s) b. What is the impulse? (Ans. – 2.78 x 10^4 kgm/s) c. What is the average force on the wall during the crash? (Ans. 1.39 x 10^5 N)
A weight lifter slowly lifts a 100 kg mass from the floor up a vertical distance of 1.90 m and then slowly lets it down to the floor again.
- Find the work done by the weight of the mass on the way up.
- Find the work done by the force exerted by the weight lifter when lifting the weight up.
- What is the total work done by the weight on the way up and the way down?
A biker and her motorcycle have a weight of 2350 N [down]. Calculate the force of kinetic friction for the rubber tires and dry concrete if the motorcycle skids. Refer to Table 5.1
The wáter is flowing through a pipe having diameters 20 cm and 10 cm at sections 1 and 2
respectively. The rate of flow through pipe is 35 litres/s The section 1 is 6 m above datum and
section 2 is 4 m above datum. If the pressure at section 1 is 39.24 N/cm2, find the intensity of pressure at section 2.
A vertical brass rod of circular section is loaded by placing a 5kg weight on top of it. If it's length is 50cm, it's radius of cross section 1cm and the young modulus of the material is 3.5power 19
When an object drop the work done on the object by earth is positive but what about the work done on earth by the object? Is this zero,negative or positive?
An object is launched at a velocity of 20 m/s in a direction making an angle of 25° upward with the horizontal. a. What is the maximum height reached by the object? b. What is the total flight time (between launch and touching the ground) of the object? c. What is the magnitude of the velocity of the object just before it hits the ground?
My question is about Einstein light clock , could you please someone can explain.
On experiment clock moving in angle 90 degrees to the light ball direction between two mirrors , what if clock moves the same direction as a light ball moving?
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