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A box slides down a 30.0 degrees ramp with an acceleration of 1.20 m/s2. Determine the coefficient of kinetic frction between the box and the ramp.
What is the diameter of an Aluminum atom? Hints the mass of 1 mole of Aliminum is 27 g. the desity of Aluminum is 2.7g/mol
Explain the following observations using principles of nuclear chemistry: Gamma rays penetrate farther into the human body than alpha or beta rays.
If a mixture of the two exhibits& ; absorbances of 0.402 at 254nm and 0.432 at 267nm, what is the concentration of each& ; compound?
A 47.3-g golf ball is driven from the tee with an initial speed of 51.6 m/s and rises to a height of 31.6 m. (a) Neglect air resistance and determine the kinetic energy of the ball at its highest po
A 76 kg diver steps off a 15 m tower and drops from rest straight down into the water. If he comes to rest 5.0 m beneath the surface, determine the average resistance force exerted on him by the wat
A 5.8 kg bucket of water is raised from a well by a rope. If the upward acceleration of the bucket is 4.7 m/s2, find the force exerted by the rope on the bucket.
Pure gold can be made into extremely thin sheets called gold leaf. What is the thickness of the gold leaf in cm? ...in nanometers?
Dan applies a force of 91 N on a heavy box by using a rope held at an angle of 50° with the horizontal. What are the vertical and horizontal components of the 91-N force?
She is attached to a 25m long bungee cord. She jumps off the platform and is in freefall until the she gets to the end of the bungee( 25 m). The bungee begins to stretch and slows her down at a rate
The hypothesis that North America was settled prior to the end of the last glaciation. You analyse the artifact and find that it has a specific activity of 2.2 dpm/g. How old is the artifact?
What is the critical value of area density for the mirror at which the radiation pressure exactly cancels out the gravitational attraction from the sun?
A car travels up a hill at a constant speed of 38.1 km/hr and returns down the hill at a constant speed of 56.6 km/hr. Calculate the average speed of the trip.
How much work is used to raise A to height h? What happens to the kinetic energy of B if its speed is doubled?
Two loudspeakers are placed next to each other and driven by the same source at a frequency of 570 Hz. A listener is in front of the speakers and on on the line separating them, thus creating a con
A compound of molecular weight 280 g/mol a concentration of 15.0 micrograms per ml absorbs 65 percent of radiation at a certain wavelength in a 2 cm cell. Calculate it molar absorptivity at a wavel
Compute the mass of the confined air on the first and the second inner cylinder using the formula m=pv where p is the density of the air
If he uses the combustion of natural gas (which is exothermic) to heat the water, how much natural gas will he need to burn? Natural gas produces 49.3 kJ of heat per gram.
Physics two skaters with masses of 65 kg and 45 kg, respectively stand 8.0 m apart each holding one end of a rope.
The density of toluene at the temperature of the experiment is 0.8035 g/ml. Calculate the density of the solid in g/cm^3.
A 58.0 kg person jumps from rest off a 12.0 m high tower straight down into the water. Neglect air resistance during the descent. She comes to rest 3.00 m under the surface of the water. Determine t
A person wearing a safety belt can withstand an acceleration of -3.0 x 10^2 m/s^2. How thick should barriers be to safely stop a car that hits a barrier at 117 km/h?
Suggest a second method suitable for determine the free calcium ions on a similar sample of bood.in each cases suggest if the sample needs pretreatment or if it could be measured directly.
A projectile is fired from the surface of the Earth with a speed of 200 meters per second at an angle of 30 degress above the horizantal. If the ground is level, what is the maximum height reached b
The equation for the reaction is S + O2= SO2 how much sulfur(in tons) present in the original materials would result in that quantity of SO2?