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The same activity is measured for two different isotope samples. One sample contains 0.0450 kg of (atomic mass = 230.033 937 u, t1/2 = 20.8 days). The second sample contains an unknown amount of (atomic mass = 231.036 264 u, t1/2 = 4.3 days). What is the mass of the second sample?
At one instant a bicyclist is 49.0 m due east of a park's flagpole, going due south with a speed of 14m/s. Then 35.0 s later, the cyclist is 49.0 m due north of the flagpole, going due east with a speed of 14m/s.
A particle with a charge of q = -5.00 nC is moving in the uniform magnetic field of vec{B}=( -1.20 T ) hat{z}. The magnetic force on the particle is measured to be vec{F}= ( -7.60×10-7 N )hat{y}.
Heat is extracted from a certain quantity of steam at 100 degrees celsius. Thus the steam changes into ice at 0 degrees celsius. If this energy were used to accelerate the ice from rest, what would be the linear speed of the ice.
A disk of mass M and radius R is initially at rest. It is acted upon by a constant torque N for a time t. what was the minumum power rating of the motor
Light from a star has an intensity of about 75.5×10-8W/m2. how far away is it from Earth
A crate of mass 45.0 kg is being transported on the flatbed of a pickup truck. What is the acceleration of the crate relative to the ground
What is the distance of the man from the pier after he walks to the front of the boat at a velocity of 3mph? Assume no friction between the boat and the water.
A satellite is in a circular orbit about the earth (ME = 5.98 1024 kg). What is the speed at which the satellite travels
Find the angle with respect to the ground
You have a converging lens of focal length 20 -cm. For what range of object distances will the image be real
You took a job as a space station scientist. On a spacewalk you get separated from the station. At what speed will you move back toward the station
A circular plastic disk of radius R, carrying a surface charge density? = ks, is rotating at constant angular velocity, Find the magnetic moment of the rotating disk
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