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  • physics help? period of oscillations?

    A wheel with a radius R, mass m and moment of inertia about the center Io = (3/4)mR^2 is pivoted at A, where the distance from the center to A, OA = (3/4)R. The acceleration of gravity is 9.8 m/s^2.

    The moment of inertia of the wheel rotating about the pivot A to be IA, the equation of motion in the small angle approximation is given by IAα= (-3/4)mgR^2θ.

    Given m =1.33 kg, R =1.54 m and g =9.8 m/s^2. Determine the period of oscillation (in s) of the wheel about A in the small angle approximation. Answer in units of s.

    Physics2 years ago

  • Best laptop for college?

    I have a low budget but I need a new laptop for college. Definitely nothing over $500, preferable nothing over $250. Basically, I need it to be:

    -lightweight (for portability)

    -long battery life

    -have access to Microsoft Word, Excel, PowerPoint, etc.

    -good internet speed

    -2 or more USB ports

    I don't need a fancy gaming laptop, just something to help me in my studies. All suggestions are appreciated.

    9 AnswersLaptops & Notebooks2 years ago
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    Physics problem help?

    Consider the setup of “aiming a gun at a target” where the initial speed of the bullet v0 = 78.6 m/s, θ = 16.6◦ and ℓ = 47.9 m.

    Consider two experiments:

    1) Experiment 1 is done on the surface of the Earth

    2) Experiment 2 is done on the surface of Moon.

    These two experiments have identical values of v0, θ and ℓ, where v0 > 0 and 0 < θ < 90◦. Denote the y-coordinate of the collision point P on the Earth and that on the Moon to be ye and ym respectively (choose the origin such that it is on the surface, which is taken to be horizontal), and the time of flight of the bullet; i.e., the time interval between firing and collision, to be te and tm respectively.

    Remember that the gravitational acceleration on the Moon is only about 1/6 as large as that on the Earth. The correct relationship between the two times is

    1. te < tm

    2. All of these possibilities may occur for

    various v0 and θ.

    3. te = tm

    4. te > tm

    1 AnswerPhysics2 years ago

  • For this object, what is x (t)?

    An object has an acceleration given by ax (t) = Dt². Its initial position is x(0) = A and its initial velocity vx (0) = B where A, B, and D are constants.

    For this object, what is x (t)?

    1. A + Bt + (1/3)Dt⁴

    2. At + Bt² + (1/12)Dt³

    3. A + Bt + (1/4)Dt⁴

    4. At + Bt² + (1/4)Dt⁴

    5. A + Bt + (1/2)Dt²

    6. (D + B) (t / 2)²

    7. At + Bt + (1 / 6) Dt⁴

    8. A + Bt + (1/12) Dt⁴

    2 AnswersPhysics2 years ago

  • I need help with a physics forces problem?

    2 AnswersPhysics3 years ago