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A sample contains 8.30×104 radioactive nuclei. In a time of 5 minutes, Evaluate the half life of the sample
A boat is traveling upstream at 20 km/h with respect to the water of a river. The water is flowing at 4.0 km/h with respect to the ground. What is the speed of the boat with respect to the ground
A woman with mass 50 kg stands at the rim of a large disk rotating at 0.5 rev/s about its center axis. What is the difference in energy of the system
A helium balloon ride lifts up passengers in a basket. Assume the density of air is 1.28 kg/m3 and the density of helium in the balloon is 0.18 kg/m3. What is the magnitude of the buoyant force on e
At time t = 0, a projectile is launched from ground level. At t = 2.00 s, it is displaced d = 56 m horizontally, what is its horizontal displacement D from the launch point
a 5 kg block moving at 4.0 m/s collides and sticks with a second stationary block of mass 3.0 kg, find the velocity of blocks after the collision
Measurements of the radioactivity of a certain isotope tell you that the decay rate decreases from 8305decays per minute, What is the half-life T1/2 of this isotope
A grating has 530 rulings/mm and is 5.4 mm wide. How many higher orders of maxima can be seen
Monochromatic light falls on two very narrow slits 0.045 mm apart. Successive fringes on a screen 5.00 m away are 6.2 cm apart near the center of the pattern. estimate the frequency of the light
A microscope has a 15.0? eyepiece and a 60.0? objective lens 20.0 cm apart. Calculate the focal length of the eyepiece
Both surfaces of a double convex lens have radii of 30.8 cm. what is the index of refraction of the lens material
A person is standing in an elevator that is stationary. What is the weight of the person when the velocity is 3 m/s upward and the acceleration is 2 m/s^2 downward
In a television set the power needed to operate the picture tube comes from the secondary of a transformer. Find the current in the primary
A laser beam of unknown wavelength shines through the two slits and produces a diffraction pattern with dark bands at y1 = 8.9mm, what is the wavelength of the laser light used
A string 0.5 m long with mass density 0.0003 kg/m and is vibrating 200 cycles per second. What hanging mass would produce this tension
A magnetic field is perpendicular to the plane of a single-turn circular coil. The magnitude of the field is changing, so that an emf of 0.66 V, What emf and current are induced in the square coil
The magnetic flux that passes through one turn of a 18-turn coil of wire changes to 5.0 Wb from 14.0 Wb in a time of 0.020 s. What is the resistance of the wire
An interferometer is used to measure the length of a bacterium. The wavelength of the light used is 650 nm. How long is the bacterium
A microscope has an objective lens with a focal length of 16.22 mm and an eyepiece with a focal length of 9.76 mm. what is the actual diameter of the red blood cell
A biology student uses a simple magnifier to examine the structural features of an insect's wing. The wing is held 3.60 cm in front of the lens, What angular magnification is achieved
An object is placed 64.5 cm from a screen. Find the magnification of the lens
A 100 m long solenoid has a radius of 0.050 m and 1.5 x 10^4 turns. Determine the self-induced emf in the solenoid due to the changing environment
Estimate the shear stress if this force is ex- erted on a 0.412 cm -thick pine board that is 13.7 cm wide
When Apollo 11 landed on the moon, the time delay for Neil Armstrong's voice to travel from the moon to Earth would be equivalent to the delay from hearing a speaker 439.5 m away. how far away is th
A transformer is designed to change 120 V into 10,000 V, and there are 164 turns in the primary coil. How many turns are in the secondary coil