Mechanics | Relativity Answers

A car starts to move at rest. It travels first 10 seconds with a constant acceleration of 2ms^-2 and the next one minute with the obtained constant velocity. During the final 30 seconds, it decelerates with a constant rate and comes to rest. Find the average velocity of the car.

A French mortar fires a projectile at an angle of 45° to horizontal with a muzzle velocity of 200m/s. A tank is advancing direct towards the mortar on a level ground at a speed of 10m/s. What should be the distance from the mortar to the tank at the instant thr mortar is fired in order to score a direct hit?

A projectile is fired with a horizontal velocity of 330m/s of a higher cliffof height 100(H)

(i) How long will it take to strike the level ground at the base of the cliff?

(ii) How far from the foot of the cliff will it strike the ground?

(iii) With what velocity will it strike the ground?

(iv) At what angle will it strike the ground?

Explain the motion of rigid body with a fixed point under no forces

A jet-fighter flying borizontally in the direction towards south and at an altitude of 5000 feet with speed 400 mi/h drops a bomb which falls down under the force of gravity. Immediately after releasing the weapon the pilot heads his plane to the northeast direction at a supersonic speed of 700 mi/h (a) what is the time the bomb is in the air" (b) How much horizontal distance does the homb covers during the fall? (c) When the bomb hits the ground, what is the distance between the bomb and the jet.

Water flows at speed of 5.5 m/s through a horizontal pipe of diameter 3 cm . The gauge pressure P1 of the water in the pipe is 1.7 atm . A short segment of the pipe is constricted to a smaller diameter of 2 cm . P1 5.5 m/s 3 cm 1.7 atm P2 v2 2 cm What is the gauge pressure of the water flowing through the constricted segment? Atmospheric pressure is 1.013 × 105 Pa . The density of water is 1000 kg/m3 . The viscosity of water is negligible.

If the density of the heavy liquid is 9.1 g/cm3 , by what height h1 does the heavy liquid rise in the left arm? 1. 0.810883 2. 0.435573 3. 0.39233 4. 0.573983 5. 0.459748 6. 0.544456 7. 0.710862 8. 0.899009 9. 0.641132 10. 0.538315

Bone has a Young’s modulus of about 1.8 × 1010 Pa . Under compression, it can withstand a stress of about 1.67 × 108 Pa before breaking. Assume that a femur (thigh bone) is 0.55 m long, and calculate the amount of compression this bone can withstand before breaking.

you normally drive on the freeway between butuan city and cagayan de oro city at an average speed of 100km/hr (62.14 mi/hr), and the trip takes 4 hours and 30 mins on a friday afternoon, however, heavy traffic slows you down and you drive the same distance at an average speed of only 70km/hr (43 mi/hr). how much longer does the trip take?

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A large gun fires a shell with a muzzle velocity of 400m/sec. What is the range of the gun when it is elevated at ang angle of 30? and 50?