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A sledge loaded with bricks has a total mass of 18.0 kg and is pulled at constant speed by a rope inclined at 19.1° above the horizontal. The sledge moves a distance of 20.4 m on a horizontal su
A Mercedes-Benz 300SL (m = 1850 kg) is parked on a road that rises 15° above the horizontal. (a) What is the magnitude of the normal force?
How do you construct an electron dot expression for the change that occurs when an atom of zinc is converted to a Zn2+ ion?
A proton cyclotron has a magnetic field of .20T between it's poles and a radius of .40m. What is the maximum energy for the protons from this machine?
In a game of basketball, a forward makes a bounce pass to the center. The ball is thrown with an initial speed of 4.3 at an angle of 15 below the horizontal. It is released 0.90 above the floor. Wh
An object is placed in front of a concave mirror, 27.0 cm from the mirror's focal point. The image formed by the mirror is five times farther away from the focal point. Calculate the focal length of
In this experiment, 0.170g of caffeine is dissolved in 10.0 mLof water. the caffeine is extracted fromt he aqueous solution three times with 5.0 mL portions of methylene chloride.
Given that the focal length of the eyepiece is 2.79 cm, and the focal length of the objective is 0.511 cm, calculate the magnitude of the angle subtended by the red blood cell when viewed through th
The concentration of a chemical degrades in water ccording tofirst-order kinetics. The degredation constant is 0.2day-1. If the initial concentration is 100.0mg*L-1, how many days are required for the
How would the rate of disappearance of ethylbromide change if the solution were diluted by adding an equal volume if pure ethyl alcohol to the solution?
A 5-g lead bullet traveling in 20oC air at 300m/s strikes a flat steel plate and stops. What is the final temperature of the lead bullet? (Assume the bullet retains all heat.) The melting point of l
Two small plastic spheres, one charged to 21 nC and the other to -21 nC, are connected by a 26-mm-long insulating rod. Suppose this dipole is placed in a uniform electric field with strength 7.4*10^
A tank with a volume of 0.150 m3 contains 27.0oC helium gas at a pressure of 100 atm. How many balloons can be blown up if each filled balloon is a sphere 30.0 cm in diameter at 27.0oC and absolute
A certain liquid has astandard enthalpy of vaporization of 26.0 kJ/mol. Determine the energy exchanged with the surroundings as heat during the process of vaporizing 0.50 mol at 250 K and 750 Torr.
A proton is released from rest just outside the surface. How far will it be from the surface of the cylinder when its speed has reached 2550 km/s? The mass of the proton is 1.67 × 10-27 kg and
What structual feature is different in isotopes of aparticular element? What do all carbon atoms and ions have in common?
A cannon shoots 5.0-kg cannon ball that carries a charge of 3.0 Coulombs at some angle above horizontal ground in a region in which there is a uniform electric field E and gravitational acceleration
Oxygen gas generated by the decomposition of potassium chlorate iscollected over water. Assume the gas is saturated with water vaporat a partial pressure of 22.4mmHg. The volume of gas collected was
A circular plastic disk with radius R = 2.00 cm has a uniformly distributed charge of Q = +(2.00 x 106)e on one face. A circular ring of width 30 μm is centered on that face, with the center of the
A wooden block of cross sectional area A and mass density ρ when floating in a liquid of density ρl displaces a volume V. If the block is displaced slightly from equilibrium (submerged, say)
A sample of methane (CH4) gas contains a small amount of helium. Calculate the volume percentage of helium if the density of the sample is 0.70902 g/L at 0.0oC and 1.000 atm.
Traveling at a speed of 18.0 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 0.600. What i
Consider the following reaction:FeSCN 2+ (aq) [red] in equilibrium with Fe 3+ (aq) [paleyellow] + SCN- (aq) [colorless] The solution was initially dark red in color.
A loop of wire is situated inside a large solenoid, with the plane of the loop initially perpendicular to the axis of the solenoid. Current can be made to flow through the loop of wire if either
One drop of water evaporates every hour. If there are 20 drops inone milliliter of water and the density of water is 1.00g/mL, how many water molecules evaporate per second.