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Calculate the molarity and the molality of an NH3 solution made up of 30.0 g of NH3 in 70.0g of water. The density of the solution is 0.982 g/mL. (Notice that we are using both molarity and molality)
2 long parallel wires carry currents 20 A and 5 A in opposite directions the wires are separted by 20 cm what is the magnetic field between the two wires
A block is attached to a pulley and is resting on a ramp. The angle the ramp makes with the horizontal is 35 degrees. What is the mass of the block on the ramp
A 70 kg human body typically contains 140 g of potassium. Potassium has a chemical atomic mass of 39.1 u and has three naturally occurring isotopes.
A gas is flowing through a certain system. At the inlet, the pressure is 0.3 MPa and the density is 1.2kg/m^3. Determine the flow work the system does to the outside
A 1-kg wood ball and a 5-kg metal ball have identical shapes and sizes. They are dropped simultaneously from a tall tower. Each ball experiences the same drag force because both have the same shape.
A conducting rod slides down between two frictionless vertical copper tracks at a constant speed of 5.3 m/s perpendicular to a 0.62-T magnetic field. Find the electrical energy dissipated in the resistor in 0.21 s
Find the electric energy density between the plates of a 225 μF parallel-plate capacitor. The potentialdifference between the plates is 345 V, and the plate separation is0.300 mm.
Two nuclei with the same mass number are known as isobars. Calculate the binding energy per nucleon for these two isobars
An astronaut moving with a speed of 0.53c relative to Earth measures her heartrate to be 71 beats per minute. Calculate the astronaut's heart rate, as measured on Earth
q1. before throwing a 1.49 kg discus an athlete rotates it along a circular path of radius 1.18 m. the maximum speed of
Electrons are accelerated through a voltage difference of 145 kV inside a high voltage accelerator tube. What is the final kinetic energy of the electrons
The output voltage of an AC generator is given by ?v = (120 V) sin (50?t). The generator is connected across a 25.0-? resistor. Find the power delivered to the resistor
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