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In addition, friction does -250 J of work on him. In both cases, the forces doing the work are non-conservative. The final speed of the skateboarder is 5.56 m/s. (a) Calculate the change (PEf - PE0)
In being launched from rest it moves through a distance of 41.3 m and has a kinetic energy of 6.09 x 107 J at lift-off. What is the work done on the jet by the catapult?
After inhaling most humans will float in fresh water, albeit with only a small fraction of their body above water. After exhaling they might start to sink slowly. From this, what should be the appro
The MetLife blimp, Snoopy One, is moving at a constant velocity of 18.93 m/s. Its velocity vector makes an angle of 15 degrees with respect to the horizontal. When it is 490.0 m above the ground, on
Given that the energy difference between the first 2 energy levels is 0.3 eV, the effective mass of electron in the quantum well is 0.067m, and m is the free electron mass.
The mass of the calculator is 24 grams, and the coefficient of kinetic friction is 0.5. If it comes to rest after 0.9 seconds, what was its initial velocity?
A spherical mirror is polished on both sides. When the concave side is used as a mirror, the magnification is +3.7. What is the magnification when the convex side is used as a mirror, the object rem
The image of this second object has the same height as the other image. How far in front of the mirror is the second object located?
A 4.4cm diameter parallel-plate capacitor has a 0.48mm gap. What is the displacement current in the capacitor if the potential difference across the capacitor is increasing at 500,000V/s
They are still here, for the most part. The former can be observed and their density is measured to be about 500 photons/cm^3, thus, there must be about that number density of neutrinos in the unive
Suppose that the speed of light in a vacuum were one million times smaller than its actual value: c = 3.00 × 102 m/s. The spring constant of a spring is 690 N/m. Determine how far you would hav
Radium is a radioactive element whose nucleus emits an alpha particle (a helium nucleus) that has a kinetic energy of about 6.8 × 10-13 J (4.2 MeV). To what amount of mass is this energy equiv
How far away from the highway would you need to build a house so that the noise from the highway is no louder than the rustle of leaves on the front lawn (10 dB)? Assume that the highway noise sprea
A typical human body has surface area 1.4 m^2 and skin temperature 33 degrees Celcius. If the body's emissivity is about 1.0, what's the net radiation from the body when the ambient temperature is 2
An LC circuit consists of a capacitor with C=2.90mF and an inductor with L = 30.0mH. At t = 0, the capacitor has a charge 6.30 mC and the current in the inductor is zero. The circuit oscillates at i
Assume that a signal passes through an opening of 4.23 m width between two adjacent buildings. What is the angular spread of the central diffraction maximum (out to the first minimum) for wavelength
A nuclear power reactor generates 2.5 × 109 W of power. In one year (365.25 days), what is the change in the mass of the nuclear fuel due to the energy being taken from the reactor?
A proton is confined to a nucleus that has a diameter of 4.8 × 10-15 m. If this distance is considered to be the uncertainty in the position of the proton, what is the minimum uncertainty in it
The kinetic energy of a particle is equal to the energy of a photon. The particle moves at 4.2% of the speed of light. Find the ratio of the photon wavelength to the de Broglie wavelength of the par
A step-down transformer converts 120V AC to 6.00V AC (rms values), and the secondary winding is connected to a purely resistive circuit having an equivalent resistance of 3.00W.. a. If the primary c
A 50.8-cm diameter disk rotates with a constant angular acceleration of 2.10 rad/s2. It starts from rest at t = 0, and a line drawn from the center of the disk to a point P on the rim of the disk ma
What is the gauge pressure at the top of the lead block? Assume that the weight of the ball is negligible and that the lake is deep enough that it does not hit the bottom. The densities of air, stee
A 6.30 cm tall object is placed 24.1 cm in front of a concave mirror with a focal length of 5.00 cm. What is the magnification?
Light is shining perpendicularly on the surface of the earth with an intensity of 680 W/m2. Assuming that all the photons in the light have the same wavelength (in vacuum) of 526 nm, determine the
A 336-g mass vibrates according to the equation x=0.4 cos(7.9 t), where x is in meters and t is in seconds. What is the period of the oscillation? Your answer should be in seconds and given to the