Physics Rotational Mechanics Level: Misc Level
A force is applied to the end of a 2 ft long unifrom board weighing 50 Ib, in order to keep it horizontal, while it pushes against a wall at the left. If the angle the force makes with the board is 30o in the direction show, the magitude of the applied force F is?
Physics Rotational Mechanics Level: Misc Level
A wheel with a rotational inertia of 8.0 kg m2 and a rotational kinetic energy of 155 joules requires what torque to bring it to rest in 4.0 s?
Physics Work,Power & Energy Level: Misc Level
How much work is done by a 3300.0 kg mass of water falling a distance of 80.0 m down a water fall?
Physics Force & Laws Of Motion Level: Misc Level
The engines of a plane exert a force of 8.5 x10 10 N during the acceleration required for takeoff.If the plane has a mass of 4.3 x 10 8 kg, what is its acceleration?
Physics Force & Laws Of Motion Level: Misc Level
A net force of 5500.0 N accelerates a car from rest to 85.0 km/hr in 7.00 sec.(a) What is the acceleration of the car?
(b) What is the mass of the car?
Physics Force & Laws Of Motion Level: Misc Level
A 2500 kg car slows from a velocity of 120.0 km/hr to 10.0 km/hr in 8.0 sec.
(a) What is the acceleration over this interval?
(b) What force must be exerted in order to produce the change in velocity?
Physics Kinematics Level: Misc Level
A diver is observed jumping from a cliff and striking the water below 3.4 sec later. How high is cliff?
Physics Kinematics Level: Misc Level
A rock dropped from a cliff hits the ground 9.5 seconds later.How high is the cliff?
Physics Kinematics Level: Misc Level
An airplane is accelerated uniformly from rest to 165.0 m/sec in 5.3 sec. What is the acceleration of the plane?
Physics Force & Laws Of Motion Level: Misc Level
5-A sledge may be either pulled with a rope or pushed from behind. Assume that in either case, the propelling force acts an angle of 45 degrees above the ground.
A- Draw the free body diagrams for both alternatives.
B- Which would be feel would be the most efficient?Why? Define efficient in your answer.
Physics Gravitation Level: Misc Level
5-A satellite of mass 50 kg is orbiting the earth at height of 1000 km (as measured above the surface of the earth).The mass of the earth is 5.98x10^24 kg and the earth,s radius is 6.38x10 ^6 m.
A- Find the speed of the satellite in its orbit.
B-If this orbit were decreased, by some external mechanism, by 100 km,would the speed of the satellite increase or decrease?Why?
Physics Force & Laws Of Motion Level: Misc Level
An older car, without ABS, is moving down the road at a speed, v, Ahead is an accident, The driver has two choices to stop:either locks the brakes or skids to a stop, the brakes, keep the wheels rolling
until coming to a stop. Which will get the car to stop more quickly?Why? identify any assumptions you make in answering this question.
Physics Work,Power & Energy Level: Misc Level
3 -A ball of mass 2 Kg is dropped from a height of 10 m. The speed of the ball is measured as 12.5 m/s just before it hits the ground. What was the work done against air friction during this fall?
Mathematics Integration Level: Misc Level
p(x)=0.03x3+0.2x2+15x+100 represents the air pollution in an industrial area due to smoke produced by x chimneys. Find the marginal value of air pollution when 3 chimneys are increased. Which value does this question indicate?
Mathematics Integration Level: Misc Level
Water is dripping out at a steady rate of 1 cu cm/sec through a tiny hole at the vertex of the conical vessel, whose axis is vertical. When the slant height of water in the vessel is 4 cm, find the rate of decrease of slant height, where the semi-vertical angle of the cone is
