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A person pushes on a stationary 125 N} box with 69N at 30degrees below the horizontal, as shown in the figure. The coefficient of static friction between the box and the horizontal floor is 1.20. What is the normal force on the box?
A diver springs upward from a board that is three meters above the water. Determine her initial velocity, both magnitude and direction
An echelette or blazed grating has 450 lines per centimeter and is ruled for the concentration of infrared light of wavelength 5.0 µm in the second order, find the angle of the ruled faces to the plane of the grating
The school bus picks up Brian in front of his house and takes him on a straight-line 3.6 km bus ride to school in the positive direction. He walks home after school. If the front of Brian's house is the origin.
A device draws 6.000 kW of power when connected to the 12.0-V output of a step down transformer. Calculate the output voltage of the generator
A 0.80-m-long organ pipe that is open at both ends resonates in the fundamental when a tuning fork of unknown frequency vibrates near one end of the pipe. what would be the fundamental frequency of a 0.80-m-long pipe that is open at one end and cl..
A tungsten wire has a radius of 0.089 mm and is heated from 20.0 to 1362 oC, When 100 V is applied across the ends of the hot wire, a current of 1.8 A is produced
A stationary particle of charge q = 2.5 x 10-8 C is placed in a laser beam (an electromagnetic wave) whose intensity is 2.6 x 103 W/m2. find the magnitude of the magnetic forces exerted on the particle
A wagon is rolling forward on level ground. Friction is negligible. The person sitting in the wagon is holding a rock. Find the speed of the wagon after the rock is thrown (a) directly forward in one case and (b) directly backward in another
Three point charges are on the x axis: q1 is at the origin, q2 is at x = 4.91 m, and q3 is at x = 6.21 m. Find the electrostatic potential energy of this system of charges if q1 = q2 = q3 = 1.55 C.
the number of radioactive nuclei present at the state of an experiment is 2.78e15. the number present twenty days later is 5.14e14. what is the half life in days of the nuclei
The Doppler effect using ultrasonic waves of frequency 2.21×106 is used to monitor the heartbeat of a fetus. calculate the maximum velocity of the surface of the beating heart
A dentist's drill starts from rest. After 2.90 s of constant angular acceleration it turns at a rate of 2.1 104 rev/min. Find the drill's angular acceleration
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