Mechanics | Relativity Answers

the required takeoff speed for a large airplane is 180 mi/hr (roughly 80 m/s). the plane is capable of acceleration at a rate of 4m/s2. assume the plane starts at rest.
a). determine the minimum runway length required for this plane to safely take off.

b). a smaller airplane requires a takeoff speed that is half as much as the large airplane. Determine the minimum runway length required for this smaller plane to safely takeoff.

A particle m is suspended by a massless string inside a trolley of mass m. Force F is being applied on trolley to move it on friction less surface. The angle theta between the string and vertical when particle is in equilibrium with respect to trolley."

Derive expressions for average energy of a body executing SHM.

Block A in Fig. 1 has mass 1.00 kg, and block B has mass 3.00 kg. The blocks are forced together, compressing a spring between them; then the system is released from rest on a level, frictionless surface. The spring, which has negligible mass, is not fastened to either block and drops to the surface after it has expanded. Block B acquires a speed of 1.20 m/s.
(a) What is the final speed of block A?
(b) How much potential energy was scored in the compressed spring?

A Reciprocating Internal Combustion Engine (RICE) uses fuel of energy content 48.3 MJ/kg, at a rate of 6 kg/h. It is tested that the engine has the thermal efficiency of 25 %. Thus, determine: i) the power output in kilowatts

A point object traverses half the distance with velocity v0. The remaining part of the distance was covered with velocity v1 for the half time and with velocity v2 for the rest half. Find the average velocity?

03.01.2016 21:25
Explain what happens when a body is raised to a height from the surface of earth and then given a horizontal velocity v such that:
i) 0 < v < 8.0 km/s
ii) v = 8.0 km/s
iii) 8.0 < v < 11.2 km/s
iv) v = 11.2 km/s

A frictionless pulley system is released from rest and moves 18.3 cm in 1.80351 s. The acceleration of gravity is 9.8 m/s2 . The image depicts a pulley system with two blocks connected together by wire, Block 1, weighing 3kg, is on a frictionless table, while Block 2, connected to the 3kg block (Block 1), is hanging off the table. The pulley being in the middle of Block 1 and Block 2.

What is the value of the mass of Block 2? Assume all surfaces are frictionless. Answer in units of kg.

A small car of mass 610 kg is parked behind a small truck of mass 1604 kg on a level road. The brakes of both the car and the truck are off so that they are free to roll with negligible friction. A 24 kg woman sitting on the tailgate of the truck shoves the car away by exerting a constant force on the car with her feet. The car accelerates at 1.3 m/s2. What is the acceleration of the truck? Answer in units of m/s2.

in physics we come across the terms UNIFORM VELOCITY, UNIFORM ACCELERATION and CONSTANT VELOCITY AND ACCELERATION . what is the difference between the term CONSTANT & UNIFORM?