Physics Answers

A race car accelerates uniformly from 18.5 m/s to 23.6m/s in 21seconds. Determine the acceleration of the car and the distance traveled

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the cross-sectional area of an adjustable single loop is reduced from 1.0m^2 to 0.50m^2 in 0.10s. What is the average emf that is induced in this coil if it is in a region where B=2.0 T upward, and the coil's plane is perpendicular to B?

Two loudspeakers are 25.0 cm apart and produce sound waves in phase. A point on the second nodal line is1.12 m from one source and 2.12 m from the other. What is the wavelength of the waves?

 A positive charge, q = +35 nC, is on the y-axis at y = +5.00 cm. (a) Determine the magnitude

and direction of the electric field at the origin. (b) What will be the magnitude and direction

of the electric field at the origin if the charge is -20 nC?

Calculate the acceleration of Josh riding his bicycle in a straight line that speeds up from 4m/s to 6m/s in 5 seconds.

A solid cylinder of mass 4kg and radius 40cm rotates about its axis with a frequency of 1/pi what is its rotational kinetic energy?

A wheel rotating at 490 rev/min accelerate uniformly at 0.5 rad/s2 for 30 second.

1 .find the angular velocity after 30s

2 . pulley peripheral speed

3 . angle turned through by a wheel during this time

1.How much charge does a particle have if it's electric field intensity at a point 10.0cm away is 5.20x10³N/C?

2.The primary winding of a transformer has 1000 turns while it's secondary winding has 500 turns.

A. If the input voltage is 220V, what is the output voltage?

B. Suppose that the current in the secondary is winding is 0.5A, what current flows in the primary winding?

1. Two charges, +3.00mC and - 2.00mC, are separated by a distance of 5.00cm. What is the magnitude of the force they exert on each other? Is this repulsive of attractive?

2. An alpha particle moves 0.003m along the direction of an electric field of magnitude 1.00x104 N/C. An alpha particle has a charge of +2e and a mass of 6.68x10-²7 kg and e is equal to 1.60x10-¹9

A. What is the work done on the alpha particle?

B. If it was initially at rest, what is it velocity after moving 0.003m

. A point charge, q= 5x10^-6 C and m=1x10^-3kg, travels with a velocity of 30 m/s then enters a magnetic field: B = 1x10^-6 T.

A a. What is the kinetic energy of the point charge? 

b. What is the magnitude of the magnetic force that acts on the charge once it has entered the field?

c. What is the magnetic force vector exerted on the charge just as it enters the field?

d. Why does the magnetic force exerted on the point charge not change its kinetic energy?