upward acceleration

Mass m1 (34.50 kg) is on a horizontal surface, connected to mass m2 (5.90 kg) by a light string. The pulley has negligible mass and no friction. A force of 220.9 N acts on m1 at an angle of 34.50 degrees. The coeficient of kinetic friction between m1 and surface is .233. Determine the upward accleration of m2. Im havi ...continues

Graphing

For my notes could you please provide a FORCE Vs TIME Graph for the following. a) a car moves away from the origin with constant velocity b) car moves tward the orgin with constant velocity c) moves away from orgin is a steady DECREASING velocity d) moves away from the origin, SPEEDS UP, THEN SLOWS DOWN e) to ...continues

Static Force

I have been trying to calculate the attached problem. Correct me if I am wrong, but the force of static frim will oppose any applied force up to a maximum force of musFn?

Exercise Physiology/Kinesiology/Physics Problem

I am trying to calculate the true wt effects of a supine leg press, standing squat, and bench press in supine. Below is communication between my previous physics professor and myself, but it really didn't answer my question. I guess I want to know if there is mathematical way to ge 'true' numbers for the actual weight involv ...continues

Density and pressure

Find the magnitude of the resultant force on one side of the plate (See attached for full question)

Work and Energy

If the work required to speed a car up from 10 km/h to 20 km/h is 5.0 x 10^3 J, what would be the work required to increase the car's speed from 20 km/h to 30 km/h?

Work and Energy

A simple pendulum has a length of 0.75 m and a bob whose mass is 0.15 kg. The bob is released from an angle of 25 degrees relative to a vertical reference line. a) Show that the vertical height of the bob when it is released is h=L(1-cos25 degrees). b) What is the kinetic energy of the bob when the string is at an angle of 9. ...continues

Work and Energy

A 3250 kg aircraft takes 12.5 min to achieve its cruising altitude of 10.0 km and cruising speed of 850 km/h. If the plane's engines deliver, on average, 1500 hp of power during this time, what is the efficiency of the engines

Spring Scales

Please see the attachment. Should not all answers from 13 - 15 read 10.5 N. The reason is that the scales balance out? Please help with these three problems.

magnitude of the gravitational force

The mass of one small ball is 1.59 g, and the mass of another is 881 g. If the center to center distance between thse two balls is 13.5 cm, calculate the magnitude of the gravitational force that each exerts on the other. Please explain