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A particular wire has a resistivity of 2.7 ? 10-8 ·m and a cross-sectional area of 4.1 ? 10-6 m2. A length of this wire is to be used as a resistor that will develop 47 W of power when connected across a 20 V battery. What length of wire is required?
m
A box of mass 5.4 kg is accelerated from rest by a force across a floor at a rate of 2.0 m/s2 for 9.0 s. Find the net work done on the box
An air hockey puck is attached to a string with a length of .45 m and is set in a circular motion with a period of 2.0 s. What is the tangential speed of the puck
Most of the motion generated by joints in the human body are examples of levers. An example of a third class lever is the forearm; what force is exerted by the biceps muscle
What will be the total horizontal distance traveled by the ball? What is the velocity of the ball (magnitude and direction) the instant before it hits the ground? That is what is its i-component? What is its j-component?
A rifle with a barrel length of 62 cm fires a 12 g bullet with a horizontal speed of 460 m/s/s. The bullet strikes a block of wood and penetrates to a depth of 15 cm.
The electric field in a region of space is oriented along the positive y axis. A circle of radius R is placed in xz-plane. The flux of the electric field by this circle is Φ. The same electric field passing through a second circle of radius 2R parall..
Two large identical flat metal plates are placed parallel to one another, seperated by a small distance compared to their linear size. One plate is given a charge per unit area 2.50E-5 C/m2 and the other a charge per unit area -2.50E-5 C/m2. Using..
if a river flows due east at 1.68m/s. a boat crosses the river from the south shore to the north shore by maintaining a constant velocity of 13.40m/s due north relative to the water. if the river is 178m wide, how far downstream is the boat when i..
makes an angle of 35.2o with the horizontal. In part b the person is looking at the top of the antenna, determine How tall is the antenna
The minute hand of a wall clock measures14 cmfrom its tip to the axis about which it rotates. find angle from a quarter after the hour to half past
A biophysics experiment uses a very sensitive magnetic field probe to determine the current associated with a nerve impulse traveling along an axon. what is the peak current carried by the axon
An unstrained horizontal spring has a length of 0.34 m and a spring constant of 290 N/m. Two small charged objects are attached to this spring, one at each end. The charges on the objects have equal magnitudes.
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