Recent content by physics_10

a) A microphone has an area of 3.8 cm^2. It receives during a 2.87 s time period a sound energy of 4.2x10-11 J. What is the intensity of the sound? b) Using the intensity in the previous question, what is the variation of pressure in the sound wave if the speed of sound is 343 m/s and the...

A square, 0.69 m on a side, is mounted so that it can rotate about an axis that passes through the center of the square. This axis is perpendicular to the plane of the square. A force of 17.1 N lies in this plane and is applied to the square. What is the magnitude of the maximum torque (in N*m)...

A man of mass 65.2 kg stands on a scaffold supported by a vertical rope at each end. The scaffold has a mass of 22.7 kg and is 2.4 m long. Suppose the man stands to the right from the middle of the scaffold that is a distance one sixth of the length of the scaffold. What is the tension in the...

hmm for some reason i am getting the incorrect answer. The question states: What is the direction of the acceleration in degrees? (Take east to be 0 degrees and counterclockwise to be positive.)

okay thank you ! & how would i find out the direction of the acceleration in degrees? tan theta = 20.8 / 3.70?

Forces of 10.6 N north, 20.8 N east, and 14.3 N south are simultaneously applied to a 3.76 kg mass as it rests on an air table. What is the magnitude of its acceleration? I tried F=√(10.6²+20.8²) a=F/m ..however this is incorrect. Can someone please tell me where I am going wrong?

Is it F1-F2.. so 26.72-11.63 = 15.09 N?

11.63 N. so that's it? I don't need to do anything with F1?

An object of mass 1.25 kg on a flat surface has two forces acting on it, F1 and F2 in the horizantal direction. F1 acts in the positive direction, F2 acts in the negative direction. The magnitude of F1 is 26.75 N. The object moves strictly along the horizontal x-axis, which we choose as positive...

Suppose that the coefficient of kinetic friction of the rubber of a car tire and the street is uk = 0.8. What is the deceleration of the car on a flat street if the driver brakes sharply, so all the wheels are locked and skidding? I'm not sure how I am supposed to solve this if only the uk is...

A crate has a mass of 24 kg. What applied force is required to produce an acceleration of 3m/s^2 if the frictional force is 90 N?

Homework Statement A brick of mass 1.0 kg slides down an ice roof inclined at 30 degrees with respect to the horizantal. If the brick starts from rest, how fast is it moving when it reaches the edge of the roof 0.90s later? Ignore friction Homework Equations Fnet = ma v2 = v1 +...