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An investigator collects a sample of a radioactive isotope with an activity of 4.3x105Bq . 48hourslater, the activity is 1.0x1105Bq .
What is the half-life of the sample?
Express your answer to two significant figures and include the appropriate units.
A ball is tossed from an upper-story window of a building. The ball is given an initial velocity of 8..00 m/s at an angle of 20.0 below the horizontal, Find the height from which the ball was thrown
Suppose a flat roof has a surface area of 9.20000×101 m2. Presume the air inside the building (and under the roof) is at atmospheric pressure, 1.01325×105 Pa, What is the lift force acting on the roof
Piles of snow on slippery roofs can become dangerous projectiles as they melt. Think a chunk of snow at the ridge of a roof with a pitch of 30 degrees. Because the snows begin to melt it will eventually slip.
Two wooden crates rest on top of one another. The smaller top crate has a mass of m1 = 16.0 kg and the larger bottom crate has a mass of m2 = 90.0 kg. what is the acceleration of the lower crate
A sign (mass 1900 kg) hangs from the endof a vertical steel girder with a cross-sectional area of0.18 m2. (Ignore the mass ofthe girder itself.) What is the stress within the girder
A parallel-plate capacitor is constructed with circular plates of radius 6.0×10?2m . The plates are separated by 0.26mm, Find the value of the dielectric constant
As a space craft approaches a planet, the rocket engines on it are fired to slow it down so it will go into orbit around the planet. how long must the engines be fired
A constant force is applied to an object, causing the object to accelerate at 11m/s2. What will the acceleration be if the force is halved
you throw a ball upward with an initial speed of 4.6 rm ms. when it returns to your hand 0.94 rm s later it has the
A loudspeaker sounds a 600 Hz tone. Find the difference in the wavelength of the sound waves produced in air at -5°C and at 36°C
Visible light passes through a diffraction grating that has 900 slits per centimeter, and the interference pattern is observed on a screen that is 2.56 m from the grating. In the first-order spectrum, maxima for two different wavelengths are separ..
A concave mirror lies flat on the floor with F=1m. A ball isdropped from 3m. Describe the image of the ball as it fallsdown and determine at what time will the sizes be equal.
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