Recent content by Melchior25

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    Linear Momentum and Collisions - True/False

    Homework Statement Two objects are at rest on a frictionless surface. Object 1 has a greater mass than object 2. When a constant force is applied to object 1, it accelerates throught a distance d. The force is removed from object 1 and is applied to object 2. At the moment when object 2 has...
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    Quick physics double check question

    Homework Statement You are riding in a chair on a ferris wheel at constant speed. When you are at the the 3 o'clock position and moving upward (counterclockwise), which of the following statements must be true. True The total force exerted on you by the chair is straight upward...
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    Ball and gravitational force question

    Homework Statement Two metal balls are the same size but one weighs twice as much as the other. The balls are both released simultaneously from a height of 5.0 meters towards the ground. Which of the following must be true about the balls during the time they are falling? (Select all that...
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    Weight lifter true/false physics question

    Homework Statement A weight lifter stands on a bathroom scale. He pumps a barbell up and down. What happens to the reading on the scale as this is done? Suppose he is strong enough to actually throw the barbell upward. How does the reading on the scale vary now? (Select all that apply.)...
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    Double check parabolic trajectory answers

    Thanks, qspeechc for checking.
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    Double check parabolic trajectory answers

    Homework Statement As a projectile moves through its parabolic trajectory, which of these quantities, if any, remain constant? (Neglect air resistance. Select all that apply.) True acceleration True horizontal component of velocity False speed False vertical component of...
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    Hawk velocity/angle problem

    So I figured out part a and part c but I'm struggling with art b. A is 50.0297 m/s and the time the hawk dove was 5.09987 s. I multiplied these two and got my hyp. I also know my y length. I drew a triangle and thought I calculated theta but my answer is wrong.
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    Projectile Motion with Neglected Air Resistance: True or False Statements

    Homework Statement A projectile is fired at some angle theta to the horizontal with some initial speed vi, and air resistance is neglected. Which statements about the projectile are true? (Select all that apply.) True The projectile is a freely falling body. True Vertical...
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    Hawk velocity/angle problem

    Homework Statement A hawk is flying horizontally at 14.0 m/s in a straight line, 250 m above the ground. A mouse it has been carrying struggles free from its grasp. The hawk continues on its path at the same speed for 2.00 s before attempting to retrieve its prey. To accomplish the...
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    Brain cramp and need equation

    Thanks, I got it. I just took the circumference and multiplied that by the rotations/sec.
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    Brain cramp and need equation

    Homework Statement Young David who slew Goliath experimented with slings before tackling the giant. He found that he could revolve a sling of length 0.750 m at the rate of 10.0 rev/s. If he increased the length to 1.050 m, he could revolve the sling only 8.00 times per second. What is...
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    Moving particle acceleration problem

    Homework Statement At t = 0, a particle moving in the xy plane with constant acceleration has a velocity of vi = (3.00 i - 2.00 j) m/s and is at the origin. At t = 2.50 s, the particle's velocity is v = (6.10 i + 4.90 j) m/s. (a) Find the acceleration of the particle at any time t. (Use...
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    Stuck on a velocity problem, need some help

    Sorry, I forgot to mention that, but yes I did figure out the the x distance to be 61.0787 m. I also figured out all the angles inside the triangle because it forms a right triangle. The equation I used was yf = (vyi)(t) + (1/2)(Ay)(t^2) I used 2.857 s as my time and set yf = to -40. I then...
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    Stuck on a velocity problem, need some help

    Homework Statement A soccer player kicks a rock horizontally off a 40.0 m high cliff into a pool of water. If the player hears the sound of the splash 3.07 s later, what was the initial speed given to the rock? Assume the speed of sound in air to be 343 m/s. The Attempt at a Solution...
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