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What lift force is necessary for a 5200 Kg helicopter to have an acceleration of 2.3 m/s/s?
A 168N sign is supported from its top surface by two ropes that each make a 22.5o angle with the horizontal. The sign is not moving. How much force is in each rope?
The sign in the last problem is now hung by ropes that each make an angle of 42o with the horizontal. How much force is now in each rope?
Two horses pull a large crate of negligible mass at constant speed across a barn floor by means of two light steel cables. What is the work done by each horse
Assuming a fica tax rate of 8% on the first 106,800 in wages, and a federal income tax rate of 20% on all wages, illustrate what would be an employee's net pay for the year if he earned 108,000?
how would the intensity of light vary with distance from the source according to the a wave theory b particle photon
Nitrogen gas is heated by a pulsed laser to 50 000 K. If the diameter of the nitrogen atoms is assumed to be 1.0 ´ 10-10 m, what is the mean free path
q1. a 4.00 x 100 g glass coffee cup is 22.0 c at room temperature. it is next plunged into hot dishwater at the
A 3.6- cm-radius ball rolls down an inclined plane from rest at the top. The angular acceleration of the rolling ball about its center is 255 rad/s2, How long is the plane
A train is travelling up a 4.5 degree incline at a speed of 3.25 m/s when the last car breaks free and begins to coast without friction. a) How long does it take for the last car to come to rest momentarily? b) How far did the last car travel befo..
Light from a He-Ne laser (= 632.8) strikes a pair of slits at normal incidence, forming a double-slit interference pattern on a screen located 1.10 from the slits. The figure shows the interference pattern observed on the screen.
A hydrogen atom has a single proton at its center and a single electron at a distance of approximately 0.0533 nm from the proton
A particle moves along the x axis. It is initially at the position 0.130 m, moving with velocity 0.190 m/s and acceleration -0.330 m/s2. FIND the position of the particle after this time
An RC circuit with C = 38.8 µF and R = 6.5 has a 27 V source in it. With the capacitor initially uncharged, an open switch in the circuit is closed. What is the voltage across the capacitor at that time
You have a lens whose focal length is 12.7 cm. You place an object on the axis of the lens at a distance of 6.25 cm from it. How far is the object\'s image from the lens
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