89 Answered Questions for the topic Mechanics

07/29/21

Short physics question involving angle and magnitudes
What is the value of an angle between two forces of equal magnitudes, when the resultant force's magnitude is the same? The answer is 120 degrees but I don't know how to approach this question
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07/29/21

Resultant force and its representation
An object of 3 kg mass with velocity in x-axis defined by the equation vx=5-2t. What is the magnitude of the resultant force's representation in the x-axis?Answer: -6N
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07/29/21

Which of these units are equal in this situation
Two objects of different mass are being pushed to opposite sides by a compressed string. Which of these units are equal in this situation.a) accelerations; b) velocities; c) distances d) forces... more
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07/28/21

Find mass when knowing distance
A toy truck from starting position within a certain time moved 60 cm. After adding 200 g mass weight onto the truck, the truck during the same amount of time moved 20 cm. Find the mass of the toy... more
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07/28/21

Physics problem, find acceleration
A car is dragging an empty trailer with a1=0.4 m/s^2, a full trailer with a2=0.1 m/s^2. Find acceleration a3 when the car is dragging an empty and a full trailers together? The correct answer is... more
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Mechanics Science Physics Forces

07/28/21

Acceleration and force
A 5 kg mass object is moving with an acceleration of 2 m/s^2. After 4 s from the start of the observation, its measured velocity was 12 m/s. What is the force acting on the body? (Answer 10 N)I... more
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Mechanics Science Physics

07/26/21

Find initial velocity
A ball was thrown vertically downwards with initial velocity v0. After 2 s of free fall it got 11 times greater velocity than its initial velocity. standard acceleration of free fall is 10 m/s^2.... more
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Mechanics Science Physics Forces

07/26/21

Physics problem about floating ball
A closed sphere/ball is floating (half of it is in the fluid). The sphere's mass is m, density ρ. What is the formula for finding the volume of the sphere?The correct answer is 2m/ρ.Can you show... more
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07/20/21

Physics problem find initial velocity
Given the equation of the moving body s=3t2+2t+1 (in SI units), find its initial velocity (at t=0). Correct answer: 2 m/s
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Mechanics Physics Vectors

07/20/21

Basic problem on force vectors
Two equal forces with magnitude F act on a box by an angle of 120 degrees. Find the magnitude of the resultant force.(The answer is F)
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05/15/21

Guess the shape of the object from its moment of inertia
A uniform round object of mass M and radius R is placed on a at surface with initialangular velocity w0 as shown in the gure below. The moment of inertia of the object about the centerof mass is I... more
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12/15/20

Kepler and Conservation of Energy
I need help wtih the following question:Consider the motion of a satellite with mass  m around a planet with mass  M (assume M>m). The orbit is elliptical.When the satellite is closest to the... more
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Mechanics Physics Energy

12/15/20

Conservation of Energy
The potential energy function of a conservative force acting on an object is given by the expressionU=y-2x2-2xwhere U is in joules and x, y, z are in meters. Consider the following two points in... more
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12/12/20

Solid Mechanics

A steel strip, which has an allowable tensile stress σmax = 165 MPa is rolled up around a spool of radius R. What is the smallest value of R if the strip width b = 10 mm and the strip thickness t =... more
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08/29/20

Mathematical pendulums
the periods of oscillations of n different pendulums (mathematical) are T1, T2, ..., Tn. The strings of these pendulums are joint into one without length loss and I got a new pendulum. Find its... more
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08/25/20

Fountain physics problem
Water from a large cylinder is coming to the fountain. The cylinder has a hole of diameter d=2 cm through which the water comes up. The water is coming at a speed of 12 m/s.I need solutions for... more
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08/25/20

Vibrations question
Suppressive vibrations (oscillations) happen so that the amplitude of the third vibration is 11,02 times greater than the amplitude of the sixth vibration. The frequency of the vibrations is 0,5... more
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08/15/20

Falling and bouncing ball problem
I have this interesting physics problem I can't solve. Could you please explain it in simple terms?A small ball thrown vertically down from height of 4,9 m with initial speed of 9,8 m/s hit a... more
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08/11/20

Very hard hanging rod problem
A straight rod of 30 cm and 600 g mass is horizontally hanged on two upright, parallel and light threads, both of them attached with distances of 5 cm and 10 cm from its ends. Find tension forces... more
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Mechanics Science Physics

08/09/20

Spring problem .
Initial lenght of a spring is l. After hanging up a load with mass m on its end, the spring stretched doubly. Where should you hang up a load of mass 2m on now stretched spring so that after... more
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Mechanics Science Physics

08/09/20

Torque question
A disk of mass 6 kg and radius 25 cm is rotating around horizontal axis that goes through its center with n=360 revolutions/min. When the disk was being stopped it stopped right after t=30 s.... more
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Mechanics Physics Dynamics

08/09/20

Cylinder physics problem
A horizontal cylinder with volume V is filled with water and stopped up with a piston. On another end of the cylinder there is a small hole whose cross-section's area s is much smaller than the... more
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Mechanics Science Physics

08/09/20

Moment of inertia
Show that the moment of intertia of a solid sphere is I=(2/5)mr^2m - massr - radiusDoes here exist a non-integral solution?
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Mechanics Science Physics

08/09/20

Inclined plane physics problem
A sphere with mass m is put on top of an inclined plane with height h. In the first case the sphere is moving downwards without friction, and in the second case with very little friction. Find the... more
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03/24/20

i need to solve for t
kinematic equation for physics/mechanicsd= vt + 1/2at^2
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