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A wire with a circular cross section and a resistance R is lengthened to 8.86 times its original length by pulling it through a small hole. After being pulled through the hole, the total volume of the wire is unchanged. Find the resistance of the wire after it is stretched.
Design a circuit in which the output voltage leads the input voltage by 30° and the current by 90°. The input voltage is a cosine wave with an angular frequency of ?. You must show (1) the phasor diagram (2) the circuit (3) the relationship betwee..
For each of the following situations, evaluate whether the relationship between the given force is less than, greater than, equal to, or can't tell and explain why that would be the case. The elevator is moving downward at constant speed.
A man uses a tire iron to loosen his lug nuts. The tire iron is 25cm long. The man applies a force of 30N at an angle of 29° to the iron. What is the torque that is applied to the lug nut
Your friend needs advice on her newest "acoustic sculpture." She attaches one end of a steel wire, of diameter 3.98 mm and density 7860 kg/m3, to a wall. What weight (in newtons) should she hang from the wire if the temperature is 17.5°C
Brianne's heart is beating at 76.0 beats per minute. Calculate the frequency of her heart's oscillations in Hz
a bread box is made to move along an x axis from x 0.15 m to x 1.20 m by a force with a magnitude given by f e-2x2
question1a 0.225kg sample of tin originally at 97.5 degrees c is dropped into 0.115kg of water firstly at 10.0 degrees
the starting current in a dc motor is 20 a but it normally operates on 110 volts with a back emf of 90 volts. what is
A tennis ball is hit with a vertical speed of 30 m/s and a horizontal speed of 25 m/s. How long will the ball remain in the air? How far will it travel horizontally during this time?
a bicyclist notes that the pedal sprocket has a radius of rp 10.5cm while the wheel sprocket has a radius of rw 6cm.
A hovercraft of mass 69.0 kg can move on a horizontal surface, the x-y plane. How much work is done on the hovercraft by the force during this time
A string fixed at both ends is vibrating in its 8th harmonic. How many nodes are on the string
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