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Question1
Astronomers detect a large asteroid that far away but still heading toward earth at 754 m/s. A straight trajectory would bring it within 3.3 x 10^8 of the earth. Though, the earth's gravitational attraction will pull it closer toward earth. Is there cause for alarm?
Question2
A 75.0 kg man, who is engaged in light activity and who is not sweating, uses internal energy at a rate of 200 kcal/h. The man then begins strenuous exercise; requiring 700 kcal/h. assuming that extra heat produced is dissipated throughout sweating and that 25 percent of the sweat evaporates, find the man's rate of sweat production in L/h.
Question3
What mass (in grams) of steam at 100 C have to be mixed with 319 g of ice at its melting point, in a thermally insulated container, to create liquid water at 57.0 C? The particular heat of water is 4186 J/kg K. The latent heat of fusion is 333 kJ/kg, and latent heat of vaporization is 2256 kJ/kg.
Two particles of masses M1 = 93000 kg and M2 = 4200 kg are initially at rest an a distance 148.1 km apart. How much time does it take for the particles to collide
Two long parallel wires are 6cm apart and carry currents of 3 and 9amps resepctively in opposite directions
A textbook of mass 1.98kg rests on a frictionless, horizontal surface. A cord attached to the book passes over a pulley whose diameter is 0.160m , find the tension in the part of the cord attached to the book
You are driving to the grocery store at 20 . You are 110 from an intersection when the traffic light turns red. Assume that your reaction time is 0.50 and that your car brakes with constant acceleration.
A 5.0-kg mass attached to a spring is displaced 8.0 cm from equilibrium position. What is the frequency of the oscillation
A string with a mass of 31 g and a length of 2 m is stretched under a tension of 67 N. How much power must be supplied to the string to generate a traveling wave that has a frequency of 51 Hz and an amplitude of 4 cm?
A nuclear-fueled electric power plant utilizes a so-called "boilingwater reactor". In this type of reactor, nuclear energy causes water under pressure to boil at 285 °C, by which the temperature of the river rises
A luggage conveyor belt is inclined at at an angle 15.6 degrees and has length 350m. Estimate the power required to operate the luggage conveyor
A duck is floating on a lake with 21% of its volume beneath the water. What is the average density of the duck
What was the speed of the car before impact
On one of the shelves in your physics lab is displayed an antique telescope. A sign underneath the instrument says that the telescope has a magnification of 20, what is the focal length fe of the eyepiece
Using Newton's Version of Kepler's Third Law II Part A Pluto's moon Charon orbits Pluto every 6.4 days with a semimajor axis of 19,700 kilometers. Calculate the combined mass of Pluto and Charon. Express your answer using two significant figures. ..
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