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Verified by AlloprofPostsecondary • 3yr.I have a physics problem. I can't seem to find a way to solve it.
A cart of mass 500 kg is rolling with a speed of 5 m/s on a railway track. There is very little friction between the tracks and the cart. You apply a constant force on the cart in the direction opposite to its velocity. From the moment you start applying the force, the cart moves 30 m before coming to a stop. What was the approximate magnitude of the force you applied?
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Verified by AlloprofSecondary IV • 3yr.
Why do we sometimes calculate the work with the cosinus of the angle between the force and the displacement and sometimes without it? Is this in a special case or an exception?
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Verified by AlloprofSecondary IV • 3yr.
The Perseverance robot weighs 1025 kg on Earth. What will be its weight on Mars? Can you help me?
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Verified by AlloprofSecondary IV • 3yr.
Why do we sometimes calculate the work with the cos of the angle between the force and the displacement and sometimes without? Is this in a special case or an exception?
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Verified by AlloprofSecondary IV • 3yr.
Hi! In a problem, I am told that the work done on an object is 250 J and that it moves 7.5 m by a force with an orientation of 45 °. How do I know the value of the force from this?
Thank you !
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Verified by AlloprofSecondary IV • 3yr.
Hi! Why does changing tires help grip? Thanks
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Verified by AlloprofSecondary IV • 3yr.
Hi! What is a lubricant used for in a mechanism? Can you give me an example? Thank youuu
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Verified by AlloprofSecondary V • 3yr.
What is the difference between weight and mass? Thank you for helping me; I do not understand!!
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Verified by AlloprofSecondary V • 3yr.
How is the phenomenon of dispersion explained?
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Verified by AlloprofSecondary V • 3yr.
Hi!
How come when I have writing on my sweater and I look at myself in the mirror, I see the writing backwards?
Thank you for your time: D
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Verified by AlloprofSecondary V • 3yr.
Hi! Could someone explain to me how white light can scatter in full color when it passes through a prism?
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Verified by AlloprofSecondary V • 3yr.
Hi! I’m confusing refraction and reflection. When I look at myself in a mirror, which of the two concepts is it? And what about when I see my straw strangely when it's in my glass of water? Thank you for your help!
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Verified by AlloprofSecondary IV • 3yr.
What is the difference between friction and grip?
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Verified by AlloprofSecondary V • 3yr.
How do you distinguish different types of forces (I am in the ATS program)?
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Verified by AlloprofSecondary V • 3yr.
Hello, can you explain to me the difference between the resultant and the balancing force ?? Thank you :))
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Verified by AlloprofSecondary V • 3yr.
What is the difference between potential energy and kinetic energy?
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Verified by AlloprofSecondary V • 3yr.
Why can't we create energy? How do power plants work if they don't create electricity?
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Verified by AlloprofSecondary V • 3yr.
I do not understand what work is in physics?
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Verified by AlloprofSecondary IV • 3yr.
How do we go from m/s to km/h and vice versa? Also, how do you convert velocities using position and time measurements?
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Verified by AlloprofSecondary IV • 3yr.
Hello! In my assignment, I have to find the displacement in meters of a car if it has driven at 1.5 m / s for 30 seconds. What should I do?
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Verified by AlloprofSecondary IV • 3yr.
Hello !
In physics, what is the difference between a closed system and an isolated system?
Thanks in advance: D
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Verified by AlloprofSecondary IV • 3yr.
Good morning!
I have a science lab this week and I don't understand why in the protocol it says to weigh the weighing scoop first by itself and after the weighing scoop plus the solution.
Can someone explain to me please?
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Verified by AlloprofSecondary IV • 3yr.
I do not understand the concept of effective force? Why would a force be ineffective?
