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They use the echoes to detect small objects, such as insects, as small as one wavelength. If a bat emits a chirp at a frequency of 60.0 kHz and the speed of sound waves in air is 343 m/s, what is th
Hydrogen iodide decomposes according to the equation 2HI (g) -- > H2(g) =I2(g) for which the Kc is .0156 at 400 degrees C. .550 mol HI was injected into a 2.00L reaction vessel at 400 degrees C.
Determine the ratio of the normal force to the magnitude of the pilot's weight. For comparison, note that black-out can occur for ratios as small as 2 if the pilot is not wearing an anti-G suit.
A car moving with an initial speed v collides with a second stationary car that is one-half as massive. After the collision the first car moves in the same direction as before with a speed v/3. (a)
If the energy from the manufacture of6.7 billion kg of nitric acid produced in 2004 were recovered and used residentially, how many households could be powered for a month by that much energy?
An object initially at rest breaks into two pieces as the result of an explosion. One piece (m2) has six times the kinetic energy of the other piece (m1). What is the ratio of the masses of the two
(a) What is the direction of the impulse delivered to the ball? (counterclockwise from the positive x axis) (b) What is the magnitude of the impulse delivered to the ball?
The skier's mass is 46.4 kg, and the coefficient of kinetic friction between the skis and the snow is 0.241. Find the magnitude of the force that the tow bar exerts on the skier.
The activation energy of a certain reaction is 76.7 kJ/mol. How many times faster will the reaction occur at 61°C than at -5°C?
Two air track carts move toward one another on an air track. Cart 1 has a mass of 0.47 kg and a speed of 0.9 m/s. Cart 2 has a mass of 0.65 kg. (a) What speed must cart 2 have if the total momentum
Ammonia (NH3) reacts with oxygen to give NO and water. How many O2 molecules are required to react with 68 grams of ammonia?
A worker stands still on a roof sloped at an angle of 39° above the horizontal. He is prevented from slipping by a static frictional force of 500 N. Find the mass of the worker.
Calculate the nonconservative work, Wnc, done by water resistance on the rock, the gravitational potential energy of the system, U, the kinetic energy of the rock, K, and the total mechanical energy
A solution contains 0.050 M Ba2+ and 0.050 MCa2+. A solution containing fluoride ions is added to selectively precipitate one of the ions. At what concentration offluoride ions will a precipit
Take a golf ball on the moon for a lunar driving range. What speed would you need to give a lunar golf ball in order to put the ball in orbit around the Moon? Do you think it could be done?
A solution contains 0.021 M Ba2+ and 0.017 MCa2+. A solution containing fluoride ions is addedto selectively precipitate one of the ions. At what concentration of fluoride ions will a precipit
At 1400 mm Hg and 286 K a diver exhales a 208 mL bubble of airthat is 77% N2 , 17% O2, and 6%CO2 by volume. How many milliliters would the volume of the bubble be at the surface and 298 K an
A car (m = 1540 kg) is parked on a road that rises 17.2 ° above the horizontal. What are the magnitudes of (a) the normal force and (b) the static frictional force that the ground exerts on the
Tidal effects in the Earth-Moon system are causing the Moon's orbital period to increase at a current rate of about 35 ms per century. Assuming the Moon's orbit around the Earth is circular, to what
Mineral oil can be used in place of mercury in manometers when small pressure changes are to be measured. What is the pressure ofan oxygen sample in mm of mineral oil if its pressure is 28.5 mmHg? (
Assuming the descent is vertical, find the magnitude of the thrust needed to reduce the velocity to zero at the instant when the craft touches the lunar surface.
The human eye can percieve green light of wavelength 550 nm whenthe rate of incidence of radiation is 2.0 x 10-16J/s. Calculate the number of photons of green light of 550 nm wavelength that must fa
Traveling at a speed of 17.2 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.630.