Physics Answers

Calculate the electric field 0.245 cm from a point charge of 25.6 nC.

Identical point charges of 9.3 nC are 0.47 mm apart. Calculate the force between the two charges. 

A car accelerates from initial velocity of 10 m/s. The acceleration id increasing uniformly from zero to 8 m/s^2 in 6 secs. During the next two seconds, the car decelerates at a constant rate of 2 m/s^2. 1) Which of the following most nearly gives the velocity after 8 seconds. 2.) Which of the following most nearly gives the distance travelled after 6 seconds.

If the velocity of a particle which moves along the S-axis is given by V= 2 - 4t + 5t^3/2 , where t is in seconds and V is in meters per seconds. The particle is at the position So = 3 m, when t = 0 1.) Compute the position S when t= 3 sec 2.) Compute the velocity of the particle when t = 3 sec. 3) Compute the acceleration of the particle when t =3 sec. (note: This is a problem under Rectilinear motion with variable acceleration use our Formula V= dS/dt, a=dV/dt, adA= VdV)

If Michael Jordan has a vertical leap of 1.89 m, then what is his takeoff speed and his hang time (total time to move upwards to the peak and then return to the ground)? 

A kangaroo is capable of jumping to a height of 4.2 m. Determine the takeoff speed of the kangaroo. 

A certain star has a parallax of 0.4 arcseconds. How far away is it (in metres)? [Type in the numerical value and units e.g. 1.23E+16m]

A planet orbits the Sun every 430 years. What is its distance (semi-major axis of the orbit) from the Sun? (Give your answer in SI units and include the unit.)

How long is a 6.8 solar mass star expected to live? (Give your answer in years, just the number, no need to include the unit.)

An automobile battery has an emf of 12.6 V and an internal resistance of 0.080 Ω. The headlights together have an equivalent resistance of 5.00 Ω (assumed constant). What is the potential difference across the headlight bulbs (a) when they are the only load on the battery and (b) when the starter motor is operated, with 35.0 A of current in the motor?