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A sled at rest is suddenly pulled in three horizontal directions at the same time, but it does not move. Paul pulls to the northeast with a force of 32 lb. Johnny pulls at an angle of 37o south of due west with a force of 54 lb. Connie pulls with a force to be determined.
a) Express the boys two forces in terms of the usual unit vectors.
b) Determine the third force (from Connie), expressing it first in component form and then as a magnitude and direction. Neglect friction.
A lab specimen is 15.2 mm from a converging lens. The image is 4.0 mm tall and 9.0 cm from the lens. How tall is the specimen?
A battery with a 12-V EMF has a terminal voltage of 11.4 V when it delivers 20A to the starter of a car. How much energy is dissipated per unit time by internal resistor
Two parallel plates of area 51 cm.^2 have equal but opposite charges of 4.10E-07 C. Within the dielectric material filling the space among the plates, the electric field is 3.60E+05 V./m. Find the dielectric constant of the material.
a 15.0 tank contains 0.209 of helium at 23.0. the molar mass of helium is 4.00 .how many moles of helium are in the
One-eighth of a sample of Th remains undercayed after 54 days. What is the half-life of this thorium isotope
Assume that you wish to fabricate a uniform wire out of0.800 g of copper. If the wire is to have a resistance R = 0.400 , and if all of the copper is to be used. What will be the length of the wire? What will be the diameter of the wire?
three balls of equal mass are fired from the same position at a height h above horizontal ground with equal speeds. the
A solenoid has 137 turns of wire uniformly wrapped around anair-filled core, which has a diameter of 6 mm and a length of 8.5cm. The permeability of free space is 1.25664 × 10−6N/A^2 . Calculate the self-inductance of the solenoid.
An unbanked circular highway curve on level ground makes aturn of 90 degrees. What is the minimum length of the curve in miles
Horseshoe bats (genus Rhinolophus) emit sounds from their nostrils, then listen to the frequency of the sound reflected from their prey to determine the prey's speed. calculate the speed of the insect
Two cars of 2000 kg each collide head-on while traveling at 75.0 miles per hour. What is the temperature increase of the cars
A kangaroo is capable of jumping to a height of 2.62 m. Determine the takeoff speed of the kangaroo
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