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A bird sits on a telephone wire midway between two poles 20 meters apart. The wire, assumed weightless, sags by 50 cm. If the tension in the wire is 90 Newtons, what is the mass of the bird?
A system consists of two positive point charges, q1 and q2>q1. The total charge of the system is +62.0 x 10^-6 C, Find q1 and q2
A cannonball (20kg) is shot from a cannon(200kg) with a velocity of 20m/s. what is the backwards velocity of the cannon
A 10-m long plank with a mass of 15-kg is supported at each. A 70 kg person stands on the plank between the supports. how far is the person standing from the left support
To estimate the muzzle speed of a blow dart, fire dart straight up into the air and time how long it takes to come back down. Roughly half of that time is the time for object to decelerate from its initial velocity to motionless. Estimation the in..
What is the maximum speed of a 2.20g particle that oscillates between x =2.0mm and x =8.0mm, Suppose the collision between the packages is perfectly elastic. To what height does the package of mass m rebound
A satellite circles the earth in an orbit whose radius is 2.25 times the earth's radius. What is the period of the satellite
A rectangular block of irons of resistivity 9.68 x 10^8 ohms has dimensions 1.50 x 1.20 x 12.0 cm , What is the maximum resistance of the block
If the current in the solenoid increases uniformly from 0 to 4.1A in 0.70s , what will be the induced emf in the short coil during this time
Two charges, +q and -q, are located in the x-y plane at points (0,+d/2) and (0,-d/2), respectively. Calculate the magnitude of the electric field at point P with the superposition principle
Draw a picture of a moving source and the waves surrounding it according to what you observed in this experiment. How does the spacing of the wavefronts in front of the source compare to those behind it?
An ac generator with a frequency of 135Hz and an rms voltage of 20.5V is connected in series with a 11.0 kOhms resistor, What is the rms current in this circuit
A probe is traveling in deep space at a speed of 4000 m/s. It has a total mass of 5000 kg. It fires its rocket motor to brake to 3000 m/s, what is the probe's final velocity
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