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An electron accelerated from rest through a voltage of 450 V enters a region of constant magnetic field. If the electron follows a circular path with a radius of 22 cm, what is the magnitude of the
An opera singer in a convertible sings a note at 600hz while cruising down the highway at 81km/h. The speed of sound n the air is 343m/s. What is the frequency heard by a person standing beside the
While attempting to tune the note C at 517 Hz, a piano tuner hears 6 beats/s between a reference oscillator and the string. What are the possible frequencies of the string?
A 60-kg boy and a 40kg girl use an elastic rope while engaging in a tug-o war on an icy frictionless surface. if the acceleration of the girl towards the boy is 3/0m/s squared determing the magnitud
The magnitude of F is 324 newtons and it points at 114o measured counterclockwise from the positive x-axis. What is the y component (in newtons) of F?
How long after the beginning of the power failure would it have taken the flywheel to stop if the power had not come back on?
A person pushes horizontally with a force of 230 N on a 60 kg crate to move it across a level floor. The coefficient of kinetic friction is 0.35. (a) What is the magnitude of the frictional force?
If 30.0 kcal of heat are supplied to 5.00 102 g of water at 23° C, what is the final temperature of the water?
A 2.8 block of wood sits on a table. A 3.0 bullet, fired horizontally at a speed of 550 , goes completely through the block, emerging at a speed of 180. What is the speed of the block immediately af
N 2 (g)+O 2 (g)?2NO(g) is carried out at a temperature at which K c = 0.060. The reaction mixture starts with only the product, [NO] = 0.0400M , and no reactants. Find the equilibrium of N2O2.
Calculate the amount of heat required to heat a 3.9kg gold bar from 28°C to 68°C. Specific heat capacity of gold is 0.128 J/g°C.
A truck travels beneath an airplane that is moving 140 km/h at an angle of 51 degrees to the ground. How fast must the truck travel to stay beneath the airplane? Answer in units of km/h.
What is the size of the gravitational force that Earth exerts on the Moon? What is the size of the gravitational force that the Moon exerts on Earth?
A mixture of He, Ne, and N2 gases has a pressure of 1.348 atm. If the pressures of He and Ne are 0.124 atm and 0.996 atm, respectively, what is the partial pressure of N2 in the mixture?
The longest recorded pass in an NFL game traveled 88 yards in the air from the quarterback to the receiver.Assuming that the pass was thrown at the optimal 45 ^circ angle, what was the speed at whi
On 200g of an ash,3.60mg of mercury was deposited on the ash. How many atoms of mercury are these?
An igneous rock originally has 3 grams of uranium-238 in it. When dated , the rock only contains 1.8 grams. What are the parent and daughter concentrations ( in percentages) and what is its age?
A rock is found to contain 3.2 grams of uranium-235, a radioactive isotope. If the rock has undergone 2.75 half lives, what was the original amount of uranium-235 in the rock and how old is the rock
A curve with a 120 m radius on a level road is banked at the correct angle for a speed of 20 {rm m/s}.If an automobile rounds this curve at 30 {rm m/s}, what is the minimum coefficient of static fri
The concentration of the radioactive isotope potassium-40 in a rock sample is found to be 3.125%. What is the age of the rock?
What would the percentage of thorium- 232(parent compound) be in a rock that was dated at 1.4 billion years?
A human piece of pottery is dated at 16,750 years old by using carbon-14. How many half lives have passed since the pottery was make?
A baseball is hit with a speed of 30.0 ms-1 at an angle of 40.0 degrees. It land`s on the flat roof of a nearby building with a height of 14m. If the ball was hit when it was 1.4 m above the ground
To get the top spinning, its string is pulled with a tension of 0.30. How long does it take for the top to complete the first five revolutions? The string is long enough that it is wrapped around th
A 4.5kg dog stands on an 18 kg flatboat at distance D=6.1m from the shore. It walks 2.4m along the boat toward shore and the nstops Assuming no friction between the boat and the water, find how far