Recent content by pttest

I heard it would be possible to have zero velocity & non zero acceleration (I know the opposite situation where there is velocity (constant), but zero acceleration). Could anyone please give me a clue on this? Thanks in advance

When I enter that answer in the box (masteringphysics HW), it says try again. So thought it might be a wrong answer.

Homework Statement After fixing a flat tire on a bicycle you give the wheel a spin. Its initial angular speed was 7.05 rad/s and it rotated 13.7 revolutions before coming to rest. What was its average angular acceleration? Homework Equations ω2 = 2 alpha . theta The Attempt at a...

Homework Statement A batter hits a pop fly straight up. a) Is the acceleration of the ball on the way up different from its acceleration on the way down? (YES / NO) b) Is the acceleration of the ball at the top of its flight different from its acceleration just before it lands?Yes / No...

Homework Statement At a playground, a 21kg child plays on a slide that drops through a height of 2.4m . The child starts at rest at the top of the slide. On the way down, the slide does a nonconservative work of -376J on the child. What is the child's speed at the bottom of the slide...

Yes, I did draw a free body diagram. In second situation since the heavier one descends (due to force of gravity) and the lighter one moves upwards I subtracted 65N from 130N. Am I in right track? If not could you please explain...? Thanks in advance

Homework Statement Buckets and a Pulley Two buckets of sand hang from opposite ends of a rope that passes over an ideal pulley. One bucket is full and weighs 130 N; the other bucket is only partly filled and weighs 65 N. a) Initially, you hold onto the lighter bucket to keep it from moving...

I am still confused how to approach the problem without knowing the mass? could anybody explain little more? Thanks in advance

Homework Statement A child goes down a playground slide with an acceleration of 1.40 m/s2. Find the coefficient of kinetic friction between the child and the slide if the slide is inclined at an angle of 29.0 degrees below the horizontal. Homework Equations Normal force = force of...

Homework Statement A block of mass m lies on a horizontal table. The coefficient of static friction between the block and the table is mu_s. The coefficient of kinetic friction is mu_k. (mu_k<mu_s) a: Suppose you push horizontally with half the force needed to just make the block move. What...

oh ok... Is the direction of rocket's acceleration downward? Thanks in advance

Homework Statement A rocket blasts off and moves straight upward from the launch pad with constant acceleration. After 3.2 s the rocket is at a height of 85 m. What the magnitude of the rocket's acceleration? What is the direction of the rocket's acceleration (upward / downward)? What is...

so would the 1st equation be?? upthrust (F_u) - Wt of the basket & people (W) = mass (m). acceleration (a) F_u - 1220 * 9.81 = 1220 * 0.59 Therefore F_u = 12919.8 N would the 2nd equation be?? F_u - (1220+mass of last person)g = (1220+mass of last person)a am I in right way ...? if not could...

Homework Statement For a birthday gift, you and some friends take a hot-air balloon ride. One friend is late, so the balloon floats a couple of feet off the ground as you wait. Before this person arrives, the combined weight of the basket and people is 1220 kg , and the balloon is neutrally...

thanks heaps