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A box is at rest on a rough surface. Two people work together to try and push it to the right, but the box remains at rest. If the first person applies a force of 250N, and the second person applies a force of 300N, what is the force of friction acting on the box to keep it at rest?
The 2.4m Hubble space telescope has been placed into Earth orbit by the same space shuttle. What angular resolution could this telescope achieve by Rayleigh's criterion
How many times brighter is a Cepheid variable of absolute magnitude 3 than a white dwarf of absolute magnitude +7? The Virgo cluster has a distance of 17 Mpc. Using Hubble's Law, determine the recessional velocity to this cluster.
q1. an archer shoots an arrow with a velocity of 45.0ms at an angel of 50.0 with the horizontal. an assistant standing
A transformer with 120. turns in its secondary supplies 12. volts at 220. ma to a toy train. The primary is connected across a 120. V wall outlet. What power is delivered by the wall outlet
A radiation detector is in the form of a circular disc of diameter 3.0cm. It is held 25cm from a source of radiation, whereit records 1250 counts per second. Assuming that the detector records every radiation incident upon it, find the activity of th..
A vertical straight wire carrying an upward 40-A current exerts an attractive force per unit length of 8.8*10-4 N/m on a second parallel wire 5.0cm away. What current (direction and magnitude) flows in the second wire?
Why did Swift have the speaker list "other expedients" to solve Ireland's problems in "A Modest Proposal"?
How mass spectrometry (MS) can be used for proteomics studies. List three different applications.
A small oxygen tank at a gauge pressure of 115 atm has a volume of 6.90 L at 20.0oC. If an athlete breathes oxygen from this tank at the rate of 9.00 L/min when measured at atmospheric pressure and the temperature remains at 20.0oC, how long will ..
An object is dropped from rest at a height of 124 m. Find the distance it falls during its final second in the air
In Millikan's experiment, an oil drop of radius 1.85 μm and density 0.852 g/cm3 is suspended in chamber C whilst a downward electric field of 0.62 × 10^5 N/C is applied. Find the charge on the drop, in terms of e.
Draw a complete free-body (free-object) diagrambelow, showing all forces acting on the beam. Find the largest possible weight of the load W you can hang on this beam without the wire breaking.
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