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1.) Uranium 238 has a half life of 1.41 x 10^17 sec if the earth is 5.5 billion years old what fraction of the original uranium 238 that was on earth when it formed is left2.) hydrogen emits red light at a wavelength of 656 nm if M = 2 what value of n does this wavelength represents?3.) you want to use a converging lens to magnify that an object 3 times. the lens has a focal length of 10 cm where should it be placed
The tension in a copper wire of length 0.5 m with two ends fixed is 200 N. What is the tensile stress if the cross sectional area is 4.0 mm^2
A billiard ball is moving in the x-direction at 30 cm/s and strikes another billiard ball moving in the y-direction at 40.0 cm/s. As a result of the collision, the first ball moves at 50.0 cm/s, and the second ball stops. In what final direction d..
The leg and cast weigh 200 N, with the center of mass as indicated by the blue arrow. The counterbalance w1 weighs 110 N. find out the weight w2 and the angle α needed so that no force is exerted on the hip joint by the leg plus cast.
A 1100 kg car increases it speed from 40 km/hr to 60 km/hr in 5 seconds. What is the resultant work done on the car
The potential difference between the plates of a capacitor is 137 V. Midway between the plates, a proton and an electron are released. find the initial speed of the proton
A golf ball is dropped from rest from a height of 9.70 m. It hits the pavement, then bounces back up, rising just 6.00 m before falling back down again. calculate the total amount of time that the ball is in the air
what is the diameter of the copper rod. Pull horizontally on a crate with a force of 140 N and it slides across the floor in a dynamic equilibrium. How much friction is acting on crate.
If a beam is incident normal (perpendicular to the surface) to a plane mirror, what is the angle of reflections
Two satellites, A and B, are in different circular orbits about the earth. Find the ratio (TA/TB) of the periods of the satellites
The wavelength of the laser beam used in a compact disc player is 649 nm. Estimate the spacing between the slits of the grating
A hockey puck impacts a goalie's plastic mask horizontally at 118 mph and rebounds horizontally off the mask at 50mph. with what speed will the goalie move
A solar cell generates a potential difference of 0.320 V when a 445.0 ? resistor is connected across it and a potential difference of 0.504 V when a 945.0 ? resistor is substituted. What is the emf of the cell
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