1. Chemist116

    How do I find the velocity of a sphere falling when an observer riding an elevator?

    The problem is as follows: In a certain shopping mall which is many stories high, there is a glass elevator in the middle plaza. One shopper riding the elevator notices a kid drops a spheric toy from the top of the building where is located the toy store. The shopper riding the elevator labeled...
  2. Chemist116

    How can I find the relative velocity given a fixed observer and another who's moving?

    The problem is as follows: In a race track an orange car $A$ is moving to the north ($\textrm{Y-axis}$) at a rate of $20\frac{m}{s}$ with respect to that a tv cameraman who is at a point labeled $O_{1}$ in the ground. Simultaneously another car (blue) $B$ is moving to the direction known as...
  3. Chemist116

    How can I find the relative velocity of yacht respect to a passenger ship?

    The problem is as follows: A passenger liner sails in the direction $N23^{\circ}E$ following a rate of $\textrm{21 knots}$ and a yacht sails in the direction of $S67^{\circ}E$ at a rate of $\textrm{28 knots}$. Find the relative velocity in knots of the yacht with respect to that of the...
  4. Chemist116

    How do I find the average angular velocity between two points?

    The problem is as follows: In the figure from below it is shown an observer who has put himself at the center of the coordinate system. He sees an object moving in a circular trajectory. If the average speed between $A$ and $B$ is $\left ( -2\hat{i}+\hat{j} \right )\frac{m}{s}$ and its position...
  5. N


    During the first 80 seconds of a falcon jet flight, the jet is propelled straight up so that in t seconds it reaches a height of s=10t^3 ft. How high does the jet travel in 80 seconds?
  6. I

    Particle in motion velocity

    A moving particle with velocity v doubles it's own velocity each second. Find the acceleration a=?
  7. G

    How Angular Velocity of Earth is 2Ï€/T?

    moment of inertia of the earth; I = \large \frac {2}{5} \normalsize MR^{2} Angular Velocity of Earth ; ω = \large \frac {2π}{T} Here Earth is considered as solid sphere. I didn't understand how Angular Velocity of Earth is \large \frac {2π}{T}?
  8. E

    Average velocity

    I found the average velocity this way x0=120 X=x0+vt X=120+0.5*80 X=160 Vav= 160÷5=32 But answer is not correct according to my book why?
  9. N

    Drift Velocity.

    Hi All, I am getting two 'slightly' different answers for this question, any help would be much appreciated. Density of electrons - 1.00 x 10^28 Diameter - 0.0280 mm Current - 8.10 Charge of electrons - 1.60 x 10^-19 After trying several times I seem to have the two following...
  10. B

    Motion Equations: Velocity Eliminate time?

    I'm reading a Physics book and currently I'm in the Motion chapter. This chapter shows how you can calculate the motion equations. Below I'm going to give you a photo of what I did so far and inside a red rectangle you can see the equation which I can't calculate. The problem is to eliminate the...
  11. T

    Given a velocity vector and a point, find the angle (urgent)

    Hello! So I am doing this vectors as velocity question and I need help solving it. Basically, James Bond is driving 70.9km/h [N] and launches himself off a cliff. A helicopter is waiting for him 20m North and 15m West from him (at the same elevation). If a large gust of wind travelling 54km/h...
  12. A

    Relative velocity

    While a boat cruises down a river, it crosses a wooden log at a particular point of time. Then the boat travels along the river for a time C and reverses its direction to travel upstream for a time T, when it meets the same wooden log, which has been freely drifting along the river all the...
  13. R

    Difference between Speed and Velocity

    Thanks for the interest my videos have been receiving from the forum. If anyone is interested here is a video that explains the difference between speed and velocity. The two terms are often used interchangeably in everyday language even though they have very different meaning. AoaqUqRSMxo
  14. Monox D. I-Fly

    [ASK] Confused About Velocity

    Something was thrown with an elevation angle 60^{\circ}. Determine its velocity and direction after: a. \frac{1}{2}\sqrt3 second b. \sqrt3 second I tried solving the (a) question by substituting the angle to the equation y=v_0\sin\alpha t-\frac{1}{2}gt^2 and got 0 (the book uses 10m/s^2 as...
  15. P

    What is the probability that the average velocity is ≥ 10^(−9 ) cm/sec?

    Physicists say that particles in a long tube are constantly moving back and forth along the tube, each with a velocity Vk (in cm/sec) at any given moment that is normally distributed, with mean µ = 0 and variance σ ^(2) = 1. Suppose there are 10^(20) particles in the tube. What is the...
  16. S

    Velocity in Momentum

    How do you get the velocity after a collision if one body towards left have a mass of 5kg while the other body with a mass of 10kg with a velocity of 2m/s towards right. How do you find the velocity of the body with the mass of 5kg towards left?
  17. L


    If a ball is thrown vertically upward with a velocity of 144 ft/s, then its height after t seconds is s = 144t − 16t². a) What is the velocity of the ball when it is 320 ft above the ground on its way up? (Consider up to be the positive direction.) b) What is the velocity of the ball when...
  18. S

    Calculate Velocity

  19. I

    Initial Velocity, Final Velocity

    I'm very stuck on this question: A small aeroplane used for skydiving moves along a runway. The aeroplane accelerates at 2 m / s^2 from a velocity of 8 m / s. After a distance of 209 m it reaches its take-off velocity. Calculate the take-off velocity of the aeroplane. The mark scheme...
  20. D

    Find acceleration ... velocity is t sin 3t ms^-1

    Hi new here. stuck on this one: Find the acceleration of a particle at time "t" seconds given that the velocity is t sin 3t ms^-1.