Physics Answers

Determine the distance of closest approach of 1.00-MeV protons incident on gold nuclei.

Explain why the householder should not be concerned about his yearly radiation dose from the ganite worktop

The great majority of alpha particles pass through gases and thin metal foils with no deflections. To what conclusion about atomic structure does this observation lead?

How much steam at 100°C must be added to 163g of water at 250C contained in a 30 g glass vessel to produce water at 77°C?

1.   A tightly wound 1500-turn toroid has an inner radius 1.00 cm and an outer radius 2.00 cm, and carries a current of 2.50A. What is the magnetic field strength at a distance of 1.20 cm from the origin? 

1.   A flux density of 1.5T is produced in a piece of cast steel by a magnetizing force of 1250A/m. Find the relative permeability of the steel under these conditions.

2.   Determine the magnetic field strength required to produce a flux density of 0.3T in an air gap of length 15 mm. 

1.   Determine the magnetic field B in air at a distance of 5 cm of a long wire where a current of 8A flows. 

2.   Find the magnetic field produced by the solenoid if the number of loops is 500 and current passing through on it is 3A (Length of the solenoid is 40 cm). 

La luz proviene del sol, tarda 8.3 minutos en llegar a la a tierra. La rapidez de la luz es de 3.00EE8 m/s. ¿A cuántos kilómetros de distancia está la tierra?

English translation:

The light comes from the sun, it takes 8.3 minutes to reach the ground. The speed of light is 3.00EE8 m / s. How many kilometers away is the earth?

In a charming 19th-century hotel, an old-style elevator is connected to a counterweight by a cable that passes over a rotating disk 1.24m in diameter. The elevator is raised and lowered by turning the disk, and the cable does not slip on the rim of the disk but turns with it. Through how many revolutions has the disk turned when it has raised the elevator 3.3m between floors?

16. A driver was instructed to follow the given directions: 7.5 km, 66° north of east and 6.0 km, 25° west of north. Unfortunately, the driver traveled in the opposite direction in the second part of his trip. What is the driver’s resultant displacement?