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The critical density of the universe is 5.80×10^?27 kg/m^3A) Assuming that the universe is all hydrogen, express the critical density in the number of H atoms per cubic meter.B) If the density of the universe is equal to the critical density, how many atoms, on the average, would you expect to find in a room of dimensions 4.80m*9.00m*3.60 ?C) Find the number of atoms in the room in part (B) under normal conditions on the earth.
The speaker coil consists of 100 turns of wire, 2cm in diameter. The current in the speaker will be 1.6 A when the force on the speaker coil is 14.8 N. What strength magnetic field will give this force.
mars has a mass of about 6.4x10^23 kg, and its moon Phobos has a mass of about 9.6x10^15 kg. how far apart are mars and Phobos
a car weighs 1,725 kg and is speeding on I-75 at 90 miles per hour. The brake rotors are made of 20 kg of iron and steel composite. What is the temperature change in the rotors
A car starts from rest and travels for 4.92 s with a uniform acceleration of +1.49 m/s2. How far has the car gone
Consider a system of 12 particles with two energy levels. Plot the number of microstates corresponding to each value of the total energy if (a) the particles are indistinguishable and (b) if the particles are distinguishable.
A wave in which the disturbance is perpendicular to the direction of travel of the wave is a... Two waves of equal amplitudes traveling in opposite directions pass through each other. After they have passed through each other, their amplitudes have..
an oxide cathode of a vacuum tube has a work function of 2.0 eV. Calculate the electron flux (number per time per area) from thermal emission when the cathode is heated to 1000 K
Two blocks are connected by a string. The smooth inclined surface makes an angle of 35 degrees with the horizontal, and the block on the incline has a mass of 5.7 kg . The mass of the hanging block is = 2.9 kg.
Angular speed is the increased to 10 rad/2 over the next 4 seconds. Illustrate what is the average tangential speed at the edge of the grindstone during this time
A positron is a particle with the same mass and magnitude charge as an electron, but a positron has a positive charge. how fast is the positron moving
The pressure inside a gas bottle at 25.5 °C is 3630 kPa. What will be the pressure inside the bottle
A 65ohms resistor, an 8.0uF capacitor, and a 35 mH inductor are connected in a series in an ac circuit. Calculate the impedance for a source frequency of 300Hz
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