28 Answered Questions for the topic Dynamics

03/06/22

Compare momentum of different moving objects
Two objects of the same volume, one is made of steel, the other is made of lead, are moving with the same velocity. Compare their momentum. The answer: the momentum of the lead object is 1.5 times... more
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03/06/22

Find momentum given a motion equation
Given a motion equation x=5-8t+4t2, and the object of 2 kg mass, find its momentum after 2 s and 4 s. What is the average force?Answers: 16 kg*m/s, 48 kg*m/s, 16 N
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02/20/22

A car of mass m, going with velocity v0 is suddenly stopped. What is the work done by friction
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01/15/22

Question on Dynamics. Finding the force
A man of 75kg is standing in the basket of a hot-air balloon. The balloon is rising at 5ms-1 and 4s later it is descending at 3ms-1. Assuming constant acceleration, find the normal contact force of... more
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01/05/22

Push away problem
An 80 kg astronaut floating in space is 30 m away from his spaceship. He wants to return to his spaceship in 10 s. With how much speed must he throw his 2 kg space hammer, directly away from the... more
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Dynamics Physics

10/01/21

At what time does the particle turn around (the turning points)?
Given s = s(t) with an initial condition s(0) = 0. It’s velocity versus potion is described by the equation v = s2 + 1. At what time (s), if any, does the particle turn around (the turning points)?
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09/28/21

Basic Physics (Newton's First Law of Motion / Dynamics)
Please do provide me a clear and detailed step-by-step solution and a final answer.A block is suspended from a rope tied to two other ropes. One rope is horizontally attached to a wall and the... more
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08/04/21

Momentum and kinetic energy

It is known that the momentum of the object is 8 kg*m/s and the kinetic energy is equal to 16 J. What is the mass and velocity of the object?
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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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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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03/16/21

should we not consider the force required to cause the static friction for car going on a curve with the help of friction?
in university physics book i found that frictional force(static) was causing an acceleration of magnitude enough to cause it to go in curve path and we took out the max velocity allowed but... more
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10/15/20

1-D Kinematics of Particles
Particle 𝐴, which is initially at rest, wants to meet Particle 𝐵, however they are 𝑋𝑌𝑍 ft away from one another. The motion of particle 𝐴 heading toward 𝐵 is defined by the relation: 𝑠 = 1/𝑎2 where... 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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Dynamics Physics Mechanics

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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07/22/20

Physics Energy Question
A 5.0 kg crate is pushed across a horizontal surface by a 60.0 N force directed 32°C below the horizontal. Determine the work done on the crate by this force after the crate moves 8.0 m.
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07/12/20

Equation of Motion for a weighted vertical spring
A spring-mass system (below) is initially at rest. If mass m is excitedby a sinusoidal force p(t) = P sin ωt, what is the response x(t), t ≥ 0? Assume that m = 1 kg, k = 100 N/m, P = 5 N, and ω = 2... more
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11/04/19

Moment of Inertia

So I have had these questions confusing me for some time and tried googling but came up with long , hard-to-understand equations and notations and articles. So I would be glad if someone could... more
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09/27/19

Coefficient of Static Friction Physics Problem
A box that weighs 50 N is pulled by a force of 10 N. The coefficient of static friction between the box and the ground is 0.5. Describe what will happen to the box? Will it start moving? Will it... more
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09/27/19

Moving Elevator Physics Problem
An elevator is suspended by a cable and the elevator weighs 5500 N. The elevator moves upward with an acceleration of 4 m/s2. Find the tension in the supporting cable. * Use 10 m/s2 for the... more
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08/13/19

If a ball moves along a curved path the path of the radius of curvature of 5m and the mass of the ball is 10 kg.What should be the velocity of the ball if the force along the normal direction is 18 N?
Dynamics. See title above for question. Looking for specific answer and/or method of solving.If a ball moves along a curved path the path of the radius of curvature of 5m and the mass of the ball... more
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08/03/19

Are the "polar vortex" and "cut-off lows" over/near the Great Lakes new phenomena?
In recent years, I've heard weather reporters describe "cut-off" low pressure systems which park over Southern Ontario for days at a time. In summer months, they bring us long stretches of cool... more
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04/15/19

Polyphony vs Monophony?
I am taking a basic music class as an elective and was given a chart to compare monophony and polyphony. The elements within the chart are: Melody, Accompaniment, Harmony, Rhythm of Words, Dynamics... more
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04/02/19

Dynamic markings and relative sound levels of instuments?
In an orchestra, various instruments have different "perceived output volume" capabilities and these change across registers. For example, flutes get louder in their higher register, bassoons are... more
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