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A diving board of length 3.00 m is supported at a point 1.00 m from the end, and a diver weighing 520 N stands at the free end. The diving board is of uniform cross section and weighs 250 N. Find t
A 3.6 kg object hangs at one end of a rope that is attached to a support on a railroad boxcar. When the car accelerates to the right, the rope makes an angle of 45 with the vertical The acceleratio
A 0.8 kg stone attached to a string is whirled in a horizontal circle of radius .18 as in the figure below. The string makes an angle of 25° with the vertical. Find the tension in the string.
Friction and air resistance are negligible. What speed does the ball have when the cable makes an angle of 30 degrees with respect to the vertical?
What is the density of a block of unknown material with a mass of 14.72 g if the dimensions are:
The acceleration of gravity is 9.8 m/s2 .Determine the magnitude of the change in the block's kinetic energy.Determine the change in the block's potential energy.Assumed: The frictional force is con
An 87.7-g arrow is fired from a bow whose string exerts an average force of 115 N on the arrow over a distance of 75.0 cm. What is the speed of the arrow as it leaves the bow?
An electric field of 7.80 105 V/m is desired between two parallel plates, each of area 37.0 cm2 and separated by 2.45 mm of air. What charge must be on each plate?
If we completely hydrolyzed 0.18 kg of water in a 8.2 L container at 300 K, what would be the total final pressure of the system in atmospheres?
The first person is initially moving forward with a speed of 2.40 m/s, and the second person is initially at rest. What are the velocities of the two people after the snowball is exchanged? Disregar
Earth's atmosphere contains many volatile substances that are present in trace amounts. The following quantities of these trace gases were found in a 1.0 gallon sample of air. Calculate number of mo
A thin 12.7 m long copper rod in a uniform magnetic field has a mass of 68.0 g. When the rod carries a current of 0.291 A, it floats in the magnetic field. What is the field strength of the magneti
Megan's mass is 30 kg. She climbs the 4.8 m ladder of a slide and reaches a velocity of 2.8 m/s at the bottom of the slide. How much work was done by friction on Megan?
An object weighs 286 N in the air. When tied to a string, connected to a balance, and immersed in water, it weighs 223 N. When it is immersed in oil, it weighs 259 N. (a) Find the density of the obj
If a sample containing 2.10 mL of nitroglycerine (density = 1.592 g/mL) is detonated, how many total moles of gas are produced?
Each cable has a length of = 3.70 . What is the tension in each of the cables? Use 9.80 for the magnitude of the acceleration due to gravity.
A motorboat heads due east at 12.0 m/s across a river that flows toward the south at a speed of 4.1 m/s. What is the angle from the original heading (with counterclockwise positive) of the boat's di
Muriatic acid can usually be purchased at the hardware store as a 20.0% concentration. How many grams of solution would be needed in order to get 12g of HCl ?
What is the horizontal component of the superhero's displacement? Draw the vectors to scale on a graph to determine the answer.
The dimerization of NO2 has a rate constant at 25 °C of 2.45 x 10-2 L/mol min. What will be the concentration of NO2 after 120. seconds, given a starting concentration of NO2 of 11.5 mol/L
What is the electric potential energy of an electron at the negative end of the cable, relative to the positive end of the cable?
A chair of weight 135 N lies atop a horizontal floor; the floor is not frictionless. You push on the chair with a force of F = 45.0 N directed at an angle of 42.0^circ below the horizontal and the
100 mol/h of n-octane is burned in 80.0% excess air to 95.0% conversion. The n-octane is converted to a mixture carbon dioxide, carbon monoxide, and water, where the ratio of carbon dioxide to carbo
A 48.0 kg mass attached to a spring oscillates with an amplitude of 2.20 m. The total mechanical energy of the system is 380 J. Find the position of the mass when its speed is 2.00 m/s. newtons
Verify that electrode A is positive as shown. Does the sign of the emf depend on whether the mobile ions in the blood are predominantly positively or negatively charged? Explain.