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To move a large crate across a rough floor, you push on it with a force F at an angle of 21 degrees below the horizontal, Find the force necessary to start the crate moving, given that the mass of t
Calculate the wavelength (in nanometers) of a photon emitted by ahydrogen atom when its electron drops from the n =6 state to then = 2 state. In nanometers...
Assume that the axis is located where the branch joins the tree trunk and is perpendicular to the plane formed by the branch and the trunk.
A 6.0-kg block is released from rest 80 m above the ground. When it has fallen 60 m its kinetic energy is approximately:
Nickel (II) chloride dissolves in water to form a lightgreen solution. What species (ions) are present in solution i.e.,what is "swimming around" in the aqueous solution? writh the formulas.
An object is placed 10.0 cm in front of a mirror. What type must the mirror be to form an image of the obect that is 2.00 m away from the mirror? What is the magnification of the image?
Predict the initial rate if [NO]= 0.30 M and [H2]=0.15 M What would happen to the initial rate of the reacton if[NO]=0.60 M and [H2]=0.15 M instead. Does your result make sense interms of order of r
A nonconducting sphere of radius 7.00 cm carries a uniform volume charge density ? = 430 nC/m^3 What is the total charge of the sphere? Find the electric field at the following radii.
What is the hydroxide ion concentration of an aqueous 0.00370 M caffeine solution? The most basic nitrogen atom in caffeine has a Kbof 4.1x10-4
We completed a lab in which we titrated vinegar. We poured 50mL water into an Erlenmeyer flask to which we added 2 drops of phenolphthalein and 1 mL vinegar.
A child holds a candy bar 15.5 cm in front of the convex side-view mirror of an automobile. The image height is reduced by one-half. What is the radius of curvature of the mirror?
What are the freezing and boiling points of a solution that contains 10.0 grams of naphthalene, C10H8, dissolved in 50.0 grams of benzene?
Magnesium metal has a specific heat of 1.04. A 70g sample of Mg at a temp of 99.8 degrees C is added to a beaker containing 50.0g of water at 30.0 degrees C. What is the final temperature.
Assuming that a drop is 0.05 mL, how many drops of a 0.10 M KI solution must be added to 100 mL of 0.010 M Pb(NO3)2 to just get aprecipitate to form? (That is, how many drops of KI are required
A thin nonconducting spherical shell of radius 6 cm carries a uniform surface charge density s = 8 nC/m^2. (a) What is the total charge on the shell? (in nc)
A small loop of wire of radius 1.7 is placed at the center of a wire loop with radius 27. The planes of the loops are perpendicular to each other, and a 6.0 current flows in each. a. Estimate the ma
A small convex mirror placed at the 20.0 cm position forms a final image at the 10.0 cm point. What is the radius of curvature of the convex mirror?
They each hear a frequency greater than 512 hz as the fork moves toward them; the difference in the frequencies they hear is 6.84 hz. Determine their respective distances below the overpass. The spe
(a) At the top of the hill, what is the normal force (using the negative sign for the downward direction) FN on the car from the track if the car's speed is v = 9.7 m/s? (b) What is FN if v = 18 m/s
The density of air is 0.48 kg/m3 at 8.3 km and 0.72 kg/m3 at 4.15 km. Assume that the airplanes have the same effective cross-sectional area and drag coefficient C.
A woman is pushing a sofa at constant speed of 1.0 m/s on a horizontal surface. She exerts a force of 80 N in the direction of the motion. a) How can the sofa move at constant speed without Newton's
A pea shooter can shoot a pea with a muzzle velocity of 8.25 m/s2 suppose the pea shot out horizontally with initial velocity from height = 1.48m above the ground. How far out along the ground will i
A particle is confined to a three-dimensional box that has sides L1, L2 = 2L1, and L3 = 3L1. Give wave function for the fifth excited state. (There are only five states that have energy levels below
A 15KW electric motor provides power for an elevator of a building. What is the minimum time needed for the elevator to rise 30 meters to the sixth floor when its total mass, when loaded, is 900Kg?
An insulating solid sphere of radius a has a uniform volume charge density and carries a total positive charge Q. Calculate the electric field at a) a point outside the surface, and b) at a point