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A baseball pitcher throws a fastball horizontally at a speed of 155km/h toward home pplate, 17.2m away. ignore air resistance. a)if the batter's combined reaction and swing times total 0.350s, how l
A ball on a porch rolls 60 cm to the porch's edge, drops 40 cm, continues rolling on the grass, and eventually stops 80 cm from the porch's edge. What is the magnitude of the ball's total displaceme
If the reaction rate doubles when the temperature is increased to 35 degrees C, what is the activation energy for this reaction in kJ/mol?
While visiting england you decide to take a jog. What is your displacement, average velocity, and average speed after running 2.0 km on strawberry fields and 1.0 km on penny lane?
Calculate the wavelength of the light emitted when an electron in a hydrogen atom makes each of the following transitions. (n=3 to n=1)
What power must a motor have to perform this task. (Answer in horse power).
Two ants race across a table 62cm long. One travels at 4.24cm/s and the other ar 2cm/s . when the first one crosses the finish line, how far behind is the second one ?
What are the oxidation states of cobalt in the following compounds (which is in the highest oxidation state?)
A total of 17.34 mL of 0.122 M H202 titrant is required to completely neutralize 25.00 mL of an unknown concentration of Fe2+ in basic aqueous solution according to the generalized redox reaction fo
The initial mass of the sample of ZnSO4 * 7H2O is 60.0g. What is the mass of this sample after it was totally (100%) dehydrated by heating on the mantle?
The mass of the Li sample is 1.40 g. After 10 min of heating Li was converted to lithium oxide and mass of the sample became 3.00 g. Calculate the mole ratio of O and Li in the lithium oxide
The piece of iron with a mass 102.9g was submerged in a graduated cylinder filled with water. The initial level of water was 20.0 ml. The density of iron is 7.86 g/ml. What was the level of water i
A hunter wishes to cross a river that is 1.0 km wide and flows with a speed of 5.0 km/h parallel to its banks. The hunter uses a small powerboat that moves at a maximum speed of 10 km/h with respect
The force exerted by the wind on the sails of a sailboat is 310 N north. The water exerts a force of 210 N east. If the boat (including its crew) has a mass of 350 kg, what are the magnitude and dir
The radius of the cylinder is 3.80 m and the coefficent of static friction between the rider and the wall is 0.480. Find the tangential velocity of the spinning wall necessary so that the riders do
A gas has a pressure if .37 atm at 50 C. what is the pressure at standard temperature?
26.0cm of a solution containinh 1.86g of X2CO3 in 250 reacted completely with 27.0cm of solution contain 3.65g of HCL per dm,calculate the molar mass of X2CO3 and relative atomic mass of X, and ide
The magnitude of the maximum acceleration is typically 1.3 , but the driver will usually maintain a constant acceleration that is less than the maximum. A train travels through a congested part of t
A certain elevator cab in a New York hotel has a total run of 185 m. Its maximum speed is 272 m/min. Its acceleration (both speeding up and slowing down) has a magnitude of 1.32 m/s2. How long does
A cannon ball made of iron has a volume of 100 . If iron has a density of 7.86 , what is the mass, in kilograms, of the cannon ball?
The distance from the center of the bar magnet to the center of the compass is 22 cm. A steady current of 0.937 amperes runs through the coil. Conventional current runs clockwise in the coil when vi
Assume that sodium atoms are regularly spaced (sodium, with atomic weight 23, has a mass density of 0.97g/cm^3) and that the photoelectrons are uniformly supplied by the top 10 layers of atoms. Find
An electron enters a uniform magnetic field with magnitude 0.2 T at a 45 angle to . Determine the radius and pitch (distance between loops) of the electron's helical path, assuming its speed is 5 m/