Physics Magnetism,Magnetic Effects Of Current Level: High School
Torque on a current carrying coil on a magnetic field
Find the maximum torque exerted on a circular coil carrying a current of 4 A , consisting of 200 turns , 10 cm in radius , and rotated in a uniform magnetic field of 0.1 T at an angular velocity of 20 rev/min .
Physics Rotational Mechanics Level: High School
A 12 kg object is attached to a cord that is wrapped around a wheel of radius r = 10 cm . The acceleration of the object down the frictionless incline is measured to be 2.00 m/s^2 . (The angle beneath the incline is 37 degrees ) . Assume the axle of the wheel to be frictionless . Determine the following .a) the tension in the rope
b) the moment of inertia of the wheel
c) the angular speed of the wheel 2.00 seconds after it begins rotating , starting from rest .
Physics Rotational Mechanics Level: High School
Rotational Equilibrium
A steel bar is 1.380 meters long and weighs 2.02 kg . A weight of 2.46 kg is hung 0.45 metres from the left hand end . The bar is to be suspended from a spring balance-and be stable and horizontal . Find the location of the point of suspension along the iron bar ?
Physics Rotational Mechanics Level: High School
Rotational Equilibrium
The upper end of a straight ladder is leaning against the vertical side of a building , with its lower end on a horizontal sidewalk . To the consternation of the painter standing on it , the upper end is slipping down the wall at a constant rate of 2 feet /sec . The lower end is , therefore , sliding along the sidewalk . Having had a course in the Calculus , the painter is , of course , interested in how fast the lower end is moving . If the ladder is 17 feet long , how fast is the lower end moving when the upper end is 15 feet above the ground ?
Physics Rotational Mechanics Level: High School
Rotational Equilibrium
A shop sign weighing 220 N is supported by a uniform 131 N beam of length L = 1.79 m as shown in the figure at “click here” . The guy wire is connected D = 1.16 m from the backboard . Find the tension in the guy wire . Assume theta = 42.2 degrees .
Physics Rotational Mechanics Level: High School
Rotational Equilibrium
Calculate F1 , for the beam shown in the figure at “click here” . Assume it is uniform and has a mass of 254 kg . For the distances assume that D1 = 1.92 m , D2 = 4.04 m, D3 = 3.10 m and D4 = 1.16 m . For the forces assume that f3 = 4160 N . f4 = 3110 N and f5 = 1950 N .
Physics Rotational Mechanics Level: High School
Rotational Equilibrium
Three boys are trying to balances on a seesaw , which consists of a fulcrum rock , acting as a pivot at the center , and a very light board L = 3.70 m long , see the figure at ‘click here’ . Three boys are already on either end . One has a mass of m1 = 49.6 kg , and the other a mass of m2 = 37.6 kg . How far from the center should the third boy , whose mass is m3 = 25.0 kg , place himself so as to balance the seesaw ?
Physics Rotational Mechanics Level: High School
Rotational Equilibrium
How far out on the diving board (see figure at “click here”) would a 56.6 kg diver have to be exert a torque of 1270 m*N on the board , relative to the left support post ?
Physics Force & Laws Of Motion Level: High School
Friction
A women is driving in her car delivering a crate of flowers sitting next to her passenger seat . The coefficient of static friction between her blue jeans and her leather seats in her car is .58 . She also know a right hand bend in the road ahead has a radius of curvature of 70 m . What minimum speed in km/hr is needed around the curve for her to get the crate of flowers to slide to her side of the car .
Physics Gravitation Level: High School
Orbital Velocity
A satellite is send into orbit about an unknown planet . The radius of orbit is 6200 km , and the satellite requires 78 minutes to make one complete orbit . What is the mass of the unknown planet ?
Physics Gravitation Level: High School
An astronaut is mass 94 kg lands on an unknown planet. He discovers he weighs only 650 N . If the unknown planet have a radius of 4300 km, what is the mass of the unknown planet ?
Physics Work,Power & Energy Level: High School
Vertical Circle
A rubber stopper is swung in a vertical circle on the end of a 1.6 m long string . If the string is not to go slack at the top of the swing , what minimum speed for the stopper is needed at the top of the swing ?
Physics Properties Of Matter Level: High School
Young’s Modulus
A cable stretched by an amount d when it supports a crate of mass M . The cable is replaced by another cable of same material having the same length but twice the diameter. What is the mass of the load that can be supported by the thicker cable if it stretches by an amount d ?
Physics Waves And Oscillations Level: High School
A simple harmonic oscillator with a speed of 2.0 is subjected to damping so that it loses one present of its amplitude per cycle . About how much energy does this oscillator lose per cycle ?
Physics Waves And Oscillations Level: High School
What is the period of a pendulum consisting of a 6-kg object oscillating a 4-m string ?