Q- A body (weight 3000N) is supported by a bracket through a vertical cable. The bracket is composed of a horizontal bar and an inclined bar, both are rigidly fastened to the wall. Neglecting the weight of the bars and the cable, determine the magnitude of the reaction R_{1} exerted by the lower fixtur…

## Solution Search

## . : "NLM"

### Newton's Laws Of Motion

### Force: Equilibrium

Q- A patient in therapy has a forearm that weighs 20.5 N and lifts a 112.0 N weight. The only other significant forces on his forearm come from the biceps muscle (which acts perpendicularly to the forearm) and the force at the elbow. If the biceps produce a pull of 232 N when the forearm is raised 4…

### Work Done by Variable Force

Q- The force verses displacement graph for a variable force acting on a particle during some displacement is given bellow (the thick lines)

(a) Calculate the total work done by this force on the particle.

(b) Which well-known physical device could produce the type of force during the first 10 seco…

### Newton's Laws: Friction

Q- A box of mass M placed on a table is connected to a hanging mass m by a string passing over a frictionless pulley as in the figure. If the box has mass of 1 kg, the coefficient of friction between the box and table surface is 0.3 and the box slides on the table at constant speed, what is the weig…

### Collision

Q- A truck was traveling north when, at intersection, collided with a car traveling east. The two vehicles remained joined together after the collision. The skid marks leading from the intersection 20 m at an angle of 30^{o} north of east before stopping. The truck weighed 1200 kg and the car weighed …

### Momentum and Impluse

(a) What is the impulse needed to stop a 20 kg bowling ball moving at 5 m/s?

(b) A 2000 kg car accidentally drops from a crane and crashes at 30 m/s to the ground below and comes to an abrupt halt. What is the momentum at impact?

(c) A railroad diesel engine weighs two times as much as a freight c…

### Newton's Laws of Motion

Q- A man claims that as long as he has his seat belt on, he can hold on to a 12.0 kg child in a 60.0 mi/h head on collision with a brick wall in which the car passenger compartment comes to a stop in 0.050 s. Is his claim true? Explain why he will experience a violent force during the collision, tea…

### Friction and Projectile

Q- A block slides 6 feet down the incline of an escalator and then it slides for 2 feet along the level portion until if flies off. If the level portion of the escalator is 3 feet above the floor, determine how far from the base of the escalator the block will strike the floor. Assume that the coeff…

### Newton's Law: Vectors

Q- Three astronauts, propelled by jet backpacks, push and guide a 195 kg asteroid toward a processing dock. One astronaut exerts a force of 30 N, 30^{0} from positive x-axis towards positive y direction, second exerts a force of 55 N along the x-axis and third astronaut exerts a force of 41 N, 60^{0} from…

### Friction

Q- An aluminum block is pushed to the right with and initial speed of v_{1}=10 ft/s at the same time a copper block is pushed to the left with an initial speed of v_{2}=16 ft/s. both blocks slide along a horizontal steel floor toward each other. if the blocks were initially d = 10 ft. apart determine how …

### Impulse and Momentum

Q- (a) What is the impulse needed to stop a 20 kg bowling ball moving at 5 m/s?

(b) A 2000 kg car accidentally drops from a crane and crashes at 30 m/s to the ground below and comes to an abrupt halt. What is the momentum at impact?

(c) A railroad diesel engine weighs two times as much as a freig…

### Motion: Variable Mass

Q- a small body of mass m_{0} is projected vertically upwards in a cloud. Its initial speed is √(2gk). During its motion the body picks up moisture from the stationary cloud. Its mass at height x above the point of projection is m_{0}(1+ ρx),where ρ is a +ve constant. Show that the greatest height h sa…

### Friction

Q- Two blocks of mass m_{1} = 12.0 kg and m_{2} = 18.0 kg connected by a rope of negligible mass are being dragged by a horizontal force F=68.0 N acting on m_{2}. The coefficient of kinetic friction between each block and the surface is 0.100 Determine magnitude of acceleration in the blocks and the tension…

### Newton's Laws

Q- An object of mass 5.00 kg, attached to a spring scale, rests on a frictionless, horizontal surface. The spring scale attached to the rear of a boxcar, has constant reading of 18.0 N when the car is in motion.

(a) Determine the acceleration of the car.

(b) What constant reading will the sprin…

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