Recent content by ScullyX51

Homework Statement A block of mass m lies on a horizontal table. The coefficient of static friction between the block and the table is µs. The coefficient of kinetic friction is µk, with µk < µs. Suppose you push horizontally with precisely enough force to make the block start to move, and...

Homework Statement A .20 kg hockey puck is launched up a metal ramp that is inclined at a 30.0 degree angle. The coefficients of static and kinetic friction between the hockey puck and the metal ramp are Ms= .40 kg and Mk=.30 kg , respectively. The puck's initial speed is 35.0 m/s. What is...

Homework Statement A 1200 kg car drives headlong into a brick wall at 14 m/s and rebound at 3 m/s. The collision lasts for .10 seconds. What is the average force on the car during the collision? Homework Equations F=ma f*change in time= mass * change in velocity f= mass*change in...

Homework Statement Two blocks are accelerated across a horizontal frictionless surface as shown. The coefficient of static friction between the two blocks is 0.7, and the coefficient of kinetic friction is 0.5, use M= 1.0 kg. When F=1.2 N, frictional forces keep the two blocks from sliding...

Homework Statement A 3.0 kg mass sliding on a frictionless surface explodes into 3 1.0kg masses. After the explosion the velocities of the three masses are: (1) 9.0 m/s north, (2) 4.0 m/s 30 degrees south of west, and (3) 4.0 m/s south of east. What is the original spped of the 3.0 kg mass...

Homework Statement A roller-coaster has a mass of 500 kg when fully loaded with passengers. The car passes over a hill of radius 15 m. When at the top of the hill, the car has a speed of 8.0 m/s. WHat is the force of the track on the car at the top of the hill? Homework Equations F=ma...

Vf2-vi2=2ad vf2=2ad (I set vi=0 since it starting at hmax) Vf= sqrt( 2*9.8*25.1)=22.2 m/s

Then if it is the same as the point of projection it would be 10 m/s, and mastering physics is saying that is wrong.

Homework Statement A boy reaches out of a window and tosses a ball straight up with a speed of 10 m/s. The ball is 20 m above the ground as he releases it. Use energy to find: 1)The ball's maximum height above the ground. 2)The ball's speed as it passes the window on its way down. 3)The...

Homework Statement A 1.00×104 railroad car is rolling at 4.00 when a 2000 load of gravel is suddenly dropped in. What is the car's speed just after the gravel is loaded? Homework Equations f=ma pi=pf The Attempt at a Solution I am very confused with this problem, but this is...

Homework Statement A red ball is heading due east, a blue ball is moving due west, and a green ball is moving north. They have initial speeds vr,i=20 cm/s, vb,i=10 cm/s, vg,i=10 cm/s. The red ball has a mass of 5 g, the blue ball has a mass of 10g, and the green ball has a mass of 5g. The...

Homework Statement An astronaut is a distance L from her spaceship, and it is at rest with respect to the ship, when she discovers that her tether is broken. She tosses a wrench with a spees Vw in the direction opposite that of the ship in ordr to propel herself back to the ship. The...

Thank you! :smile:

yes. I was very confused by that as well...but I am pretty sure vector a is referring to acceleration.

Homework Statement Three identical blocks connected by ideal strings are being pulled along a horizontal frictionless surface by a horizontal force F_vec. (Intro 1 figure) The magnitude of the tension in the string between blocks B and C is T = 3.00 N. Assume that each block has mass m =...