Master Physics with Fun Quizzes & Brain Teasers!

A sample of wood from an archaeological excavation is dated by using a mass spectrometer to measure the fraction of 14C atoms. Suppose that 173 atoms of 14C are found for every 2,561,140,426,409,936 atoms of 12C in the sample. What is the woods age? The half-life of carbon 14 is 5730 years.The natural abundance of carbon 14 in a sample of carbon is 1.3 x 10-12 per 1 of carbon 12.
1 Answer
An ice skater spins with angular speed omega and initial frequency fi. He brings his arms closer to his body, increasing his angular speed to 2 His final frequency is ff
1 Answer
How would Coulomb's Law be written if the charge of an electron was instead defined as positive and the proton as negative?F = -kQq/r2F = kQq/r2F = -kQ/r2F = kq/r2
1 Answer
What is the index of refraction for a medium where light has a velocity of 1.75 x108 m/s?5.750.5771.731.25
1 Answer
275mm=cm conversions
1 Answer
55) A typical arteriole has a diameter of 0.080 mm and carries blood at the rate of 9.610^5 cm3/s. (a) What is the speed of the blood in an arteriole? (b) Suppose an arteriole branches into 8800 capillaries, each with a diameter of 6.010^6 m. What is the blood speed in the capillaries? (The low speed in capillaries is beneficial; it promotes the diffusion of materials to and from the blood.)
1 Answer
9. Two gears are pressed together. The smaller gear is being poweredby a motor and has a constant tangential velocity of 0.2 m/s at itsedge. The radius of the smaller gear is r and the radius of the largergear is 31a. What is the angular velocity of the larger gear, in terms of r?Coin 2-0.06 roadsV = wrsrb. The smaller gear's angular velocity is doubled. How does thataffect the angular velocity of the large gear? Show your work and explain your answer
1 Answer
When negative charges concentrate at one end of an object that is made of a conducting material, the object is
1 Answer
If an object is between a concave mirror and its focal point, the image will be(A) real and smaller than the object.(B) real and larger than the object.(C) virtual and smaller than the object.(D) virtual and larger than the object.
1 Answer
A 100 W engine generates 100 J of energy. How long did it run for?
1 Answer
6. What is the mass of an object that requires a force of 30 N to accelerate at 5 m/s??
1 Answer
A + 9.12 nC point charge and a - 2.78 nC point charge are 4.99 cm apart. What is the electric field strength at the midpoint between the two charges?
1 Answer
It was a snow day, so Eric and some friends went sledding. He boarded his 60-inch sled and descended the steepest section near the tall trees. Before his ride ended at the location of a tree stump buried a few inches below the snow, he was accelerating at 2.48 m/s/s down the 21.9 incline. Determine the coefficient of friction between the sled and the snow. (Coefficients of friction are positive, so use the absolute value of your answer.)Use the approximation g 10 m/s^2.Answer: ___________ (no units) (rounded to the thousandths place)
1 Answer
An 8000 kg car moving at a constant speed of 14m/s strikes a barrier. The two stick together and move for a while at a speed of 5m/s. What is the mass of the barrier?Show Your Solution
1 Answer
A car accelerates from 2.6 to 14 m/sec in 11.2 seconds. Calculate its acceleration.m/se
1 Answer
Hello,I am a grade 10 student and I am looking for some help on physics equations (acceleration, time distance, etc). I am also looking in to calculating speed, distance and time. I am studying for an exam and I have a preparation worksheet.
1 Answer
A resistor is placed in a circuit the voltage of the circuit is changed and the current us mesuared the graph seen here shows the data that was collected
1 Answer
The mass of the sun is lost at the rate of 2.0 X 10^9 Kg/s, calculate the power output of the sun in Kilowatts ( speed of light in a vacuum is 3.0 X 10^8 m/s)
1 Answer
mas force enco 6. A large raindrop (2500 pm = 2.5 mm radius) is 100 times the radius of a typical cloud droplet (25 um). How many times greater is its volume?
1 Answer
A block of copper has a volume of 4 m3 if the mass is 356,000 kg what is the density of copper?
1 Answer
Kevin drops a pile of roof shingles from the roof 8.52 meters above the ground.Determine the time it takes for the shingles to reach the ground?
1 Answer
25. Which picture correctly shows the path of the reflected light ray given an object inside the focal point?Select one:a. Ab. Bc. Cd. D
1 Answer
In a certain standing wave pattern. The distance from one node to the next is 2.0 m. What is the wavelength of one of the standing waves?
1 Answer
Radioactivity is a natural process.Question 3 options:TrueFalse
1 Answer