Physics Answers

A current of 5.75 A flows in the coil of wire from an applied voltage of 120 V. The motor operating at normal speed creates a back EMF of 32.0 V. What is the resistance of the coil?

A circular loop of 80 turns with radius 15.0 cm is perpendicular to a magnetic field of 0.52 T. How much induced voltage is created if it is rotated in 0.20 s so that its face is parallel to the field?

Solve the problem with complete and proper solution. Mercury has a mass of 11.2 g, If its volume is 2.3 x 10^-3 m^3 calculate for its density.

A 50-turn coil has a resistance 2.5 Ω. If it is enclosed in an area of 25 cm2, what would be the rate of change of a magnetic field parallel to its axis to induce a current of 0.5 A in the coil?

Solve the problem with complete and proper solution. An object has a density of 5.6 x 10^5 kg/m^3. What is the mass of the object if its volume is 4.5 x 10^-8 m^3?

What factors determined whether an object will float or sink? (3-5 sentences)

How does a fluid exert pressure? (3-5 sentences)

How does the density of a material affects its use? ( 3-5 sentences)

Solve the problem involving speed of transverse wave in string with complete solutions. A guitar string has a length of .75 m and a mass of 4.8 g when subjected to a tension of 350 N. Calculate for the speed of the wave.

Compare and contrast. Transverse wave and longitudinal wave.