89 Answered Questions for the topic Mechanics

Mechanics

01/16/20

Calculate the horizontal and vertical components of a 280N force pulling upwards at an angle of 33 degrees to the horizontal
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Mechanics Physics

11/03/19

A youngster shoots a bottle cap up a 22.0o inclined board at 1.97 m/s. The cap slides in a straight line, slowing to 1.03 m/s after traveling some distance.

If the coefficient of kinetic friction is 0.36, find that distance. 
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Mechanics Physics

11/03/19

A block is on an incline whose angle can be varied. The angle is gradually increased from 0o. At 34.0o, the block starts to slide down the incline.
It slides 2.9 m down the incline in 1.7 s. Calculate the coefficient of static friction. Calculate the kinetic coefficent of friction for the above problem. 
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Mechanics Physics Work Forces

06/28/19

Finding work done in an inclined plane
I'm trying to solve a textbook problem that says:A boy in a wheelchair (total mass 47.0 kg) has speed 1.40 m/s at the crest of a slope 2.60 m high and 12.4 m long. At the bottom of the slope his... more
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Mechanics Mathematics Vectors

06/02/19

Mechanics question (Vectors)
I'm really confused as to what I'm supposed to do here can someone please explain...The question is:The horizontal unit vectors i and j are in the directions east and north respectively.A model... more
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05/26/19

How do you calculate the degrees of freedom of a system?
As above..............................
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05/13/19

Why are x and y equal?
This is the question I am doing:A small object is projected with speed 24 m/s from point O at the foot of a plane inclined 45 degrees to the horizontal. The angle of projection is 15 degrees above... more
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Mechanics Physics

10/29/18

Physics statics calculations
The question is : A metre rule of weight 1.0N is pivoted on a knife-edge at its centre of mass, supporting a weight of 5.0N and an unknown weight W. To balance the rule horizontally with the... more
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Mechanics

07/14/18

Time taken to reach maximum height when a distress rocket is fired vertically into the air with an initial velocity of 49m/s
Its about linear motion on object moving vertically upwards
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07/04/18

If classical physics laws fail at the quantum level , why do we still use classical physics formulas for deriving relations at an subatomic level ?
While getting a lecture on drift velocity of electrons , i came across the formula F=MA being used for electrons . also equations of motions were applied to subatomic particles . but if classical... more
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Mechanics

06/01/18

Average velocity for the complete motion of the vehicle in ms-1
a motor vehicle moves half of it's path with a velocity 60ms-1 and the other half with a velocity 40ms-1. Average velocity for the complete motion of the vehicle in ms-1
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Mechanics Physics Maths Energy

05/14/18

Proving that a value does not decay in the process of motion
Hi   How do I go about proving that a value for energy does not decay during the process of motion?    Thanks    
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05/09/18

Finding the potential of a force
Hi   I have been asked to find the potential V(x) of the force F(x)=k(x-L).   Can anyone help me with this please? Thanks
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05/07/18

Motion in 3d - acceleration and its components
Hi   I have found the vector for the acceleration of a particle in 3d, however I have been asked now to give its component that is tangential to the trajectory of the particle. Can I get some... more
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Mechanics Velocity Motion Speed

05/06/18

Finding the speed in 3D motion
Hi   I have been given the position vector of a particle, and have then differentiated this to get the velocity vector for the patricle. I have now been asked to find the speed, but am not sure... more
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04/02/18

If I have been given a graph of potential energy, how do I sketch typical trajectories in the phase plane?
The particle is moving in the x-axis under the action of a conservative force with a potentialenergy V (x).
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03/24/18

Centripetal forces with cars
A car can round a banked curve at an 84 m radius and a maximum speed of 16 m/s without relying on friction. What is the angle does the car bank when it turns?  
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03/23/18

Circular Motion: Finding the angle from the vertical
A .25 kg object is attached to a 0.80m string. The object is pulled to a point so that the string makes an angle θ from the vertical. It is then released. At the bottom of the object's path, the... more
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03/22/18

Circular motion: finding the centripetal acceleration without mass, velocity, or tension given
I can't seem to solve this question... A ball is swung in a horizontal circle so that the string makes a 26º with the pole it is attached to. What is the centripetal acceleration?
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Mechanics

03/16/18

Two mechanics worked on a car. The first mechanic worked for 15 hours, and the second mechanic worked for 5 hours. Together they charged a total of $1225 .
Two mechanics worked on a car. The first mechanic worked for 15hours, and the second mechanic worked for 5hours. Together they charged a total of $1225. What was the rate charged per hour by each... more
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Mechanics Work Forces Newton

02/19/18

Mechanics Question - Finding speed reduction time
A car of mass 1000 kg has its speed reduced from 81 km/h to 54 km/h by brakesproducing a force of 1250 N. How long does this take? Determine the work done bythe brakes on the car. Determine... more
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01/13/18

A pendulum bob of mass 2 kg is hanging by a steing of length 1m . A bullet of maa 0.5 kg moves with 10 m/s strikes the bob and gets embrdded into it.
Find the maximum angle of deflection from verticle to which the string will be deflected by conservation of energy principle. 
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01/12/18

A bullet of mass m moves with a horizontal speed u to strike a large wooden block of mass M that hangs vertically by two cords.
On stricking the bullet gets embedded into the block of mass M amd tbe system ( bullet+ pendulum) swings up to a maximum height h. Show that u= ((m+M)/m)* sqrt of 2gh
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Mechanics Maths

07/28/17

physics/mechanical question, need help with
Really unsure with this topic so could you please show working out and how its done for me, huge thank you. 1) For the shape below, showing all calculations find the centroid of the composite... more
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02/05/17

4. Two closed organ pipes of length 0.5 m and 0.525 m are sounded together and produce 6 beats per second.
4. Two closed organ pipes of length 0.5 m and 0.525 m are sounded together and produce 6 beats persecond. What is the velocity of sound in the medium with which the organ pipes are filled?
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