Basic question

A force F applied to an object of mass m1 produces an acceleration of 3.00m/s^2 the same force applied to a second object of mass m2 produces an acceleration of 1.00m/s^2 (a)What is the value od m1/m2?.........I understand that a2/a1=1/3 --answer (b)if m1 and m2 were combined find their acceleration under the action of th ...continues

Determining Center of Mass

Find the center of mass of a system of three particles of mass 2 kg, 3kg and 4 kg placed at the corners of an equilateral triangle of side 2 meters.

Average acceleration

Hi. Here's my problem: "A tennis ball with a speed of 11.8 m/s is thrown perpendicularly at a wall. After striking the wall, the ball rebounds in the opposite direction with a speed of 8.51 m/s. If the ball is in contact with the wall for 0.00175 s, what is the average acceleration of the ball while it is in contact with the ...continues

uniform acceleration

"A car accelerates from rest and travels for 4.98 s with a uniform acceleration of +1.50 m/s^2. The driver then applies the brakes, causing a uniform acceleration of -1.99 m/s^2. If the brakes are applied for 3.06 s, how fast is the car going at the end of the braking period? And how far has the car gone?"

constant acceleration/maximum height

"A model rocket is launched straight upward from the ground with an initial speed of 53.3 m/s. It rises with a constant upward acceleration of 1.86 m/s^2 until its engines stop at an altitude of 161 m. What is the maximum height reached by the rocket?" I'm not sure how to proceed with this problem. Here's what I know (I think ...continues

uniform decceleration

"A person who is properly constrained by an over-the-shoulder seat belt has a good chance of surviving a car collision if the decceleration does not exceed 26.0 G's (1.00 G = 9.8 m/s^2). Assuming uniform decceleration of this value, calculate the distance over which the front end of the car must be designed to collapse if a cras ...continues

acceleration

"A fugitive tries to catch a freight train traveling at a constant speed of 5.95 m/s. Just as an empty box car passes him, the fugitive starts from rest and accelerates at 3.84 m/s^2 to his maximum speed of 8.23 m/s. How long does it take him to reach the empty box car?" Thank you!

Subtracting vectors

"The figure below (please see attached Word file) shows three vectors of lengths A = 67.8, B = 39.5, and C = 47.0. The angles are theta(a) = 28.8° and theta(b) = 54.5°, and C points along the negative y-axis. Determine the length of the vector A - C." The book indicates that the equation for subtraction of vectors is si ...continues

vectors/time in motion

"An artillery shell is fired with an initial speed of 1.80x10^3 m/s at a angle of 54.3 degrees above the horizontal and returns to its original level before impact. Neglecting air resistance, calculate the time it is in motion. And calculate the horizontal distance traveled." Thank you!

vectors, velocity

Hi. This problem seems like it should be pretty easy, but I just can't get the right answer. Here it is: "The pictures below (see attached Word file) show cannonballs of two different masses projected upward and forward. The cannonballs are projected at various angles above the horizontal, but all are projected with the same ...continues