Recent content by cougar_21

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    Calculating the Escape Velocity from a Neutron Star

    thank you andrew and gnome, i would get the square of a negative answer and knew that was not right, but indeed I missed the minus sign. Thanks for the explanation gnome it helped me understand what i was doing ! Thank you both bunches XD!
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    What is the Period of a Satellite at 90km Above the Moon's Surface?

    i had most of it but was forgetting to add the R of the moon to the distance of the sat above the moon >.<.
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    Calculating the Escape Velocity from a Neutron Star

    Question: The radius of a neutron star is 750 times smaller than the Earth's radius, and its mass is 1.8 times larger than the Earth's mass. What is the escape velocity from the surface of a neutron star? (Ignore the fact that, at high speeds, one should not really use mv^2/2 for the kinetic...
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    What is the Period of a Satellite at 90km Above the Moon's Surface?

    wow thanx, i missed that thread XD
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    What is the Period of a Satellite at 90km Above the Moon's Surface?

    What is the period of a satellite circling the Moon at a height of 90km above the Moon's surface? Can someone get me started please?
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    Calculating Acceleration Due to Gravity on the Moon and Mars

    thank you !
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    Estimate Sun's Rotation Period as a Neutron Star

    in a period d=days
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    Calculating Acceleration Due to Gravity on the Moon and Mars

    k so then the second equation is the correct one? TY o:) Another question since the R is in km should I change it to meters?
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    Calculating Acceleration Due to Gravity on the Moon and Mars

    k i took a different approach please tell me which one is the correct one: this time i took Gm/R^2 to get the acc. for a i got 1.62 m/s^2 o.0 sorry i really have no clue what I am doing :frown:
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    Calculating Acceleration Due to Gravity on the Moon and Mars

    Ok, please tell me if i am correct, or totally out of it :confused: What is the acceleration due to gravity on the surface of (a) the Moon (R=1.74x10^3km, m= 7.35x10^22kg) (b) Mars (R=3.40x10^3km, m= 6.42x10^23kg) i used v= square root of m/R for a i got 6.4993x 10^9 for b i got...
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    Understanding Conceptual Questions for Exam - Physics 101

    Thank you i understand prefectly ! Hope I pass my test today
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    Understanding Conceptual Questions for Exam - Physics 101

    I know that getting tired is independent form work, since there is no work when on constant speed, but I don't know why you get tired does it have to do with energy I know that the conservative force is a force for which the work is independent of the path. But nothing else. :confused...
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    Understanding Conceptual Questions for Exam - Physics 101

    You do no net work when you walk at a constant speed . Why do you get tired? Is the force of a tennis racket acting on a tennis ball a conservative force? A vase falls to the floor and shatters. Is momentum conserved in the collision?What objects needto be taken into account in describing...
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    Calculating Wheel Revolutions with Rotational Kinematics

    you divided wrong it's supposed to be total distance divided by the 0.628mpi
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    Velocity and Acceleration of a particle

    Velocity and Acceleration Please Help! My problem reads: A particle is observed to move with the coordinates x(t)=(1.5m/s)t + (-0.5 m/s^2)t^2 and y(t) = 6m + (-3m/s)t + (1.5 m/s^2)t^2. What are the particle's position, velocity, and acceleration? At what time(s) are the velocity's...