when do I use the absolute value brackets on the point charge? E = k (q)/r^2 vs E = k |q|/r^2 ?

when do I use the absolute value brackets on the point charge? E = k (q)/r^2 vs E = k |q|/r^2 ?

High School Physics

This is everything that is provided in the question aside from a few word changes due to the academic honesty policy and the character limit. To clarify the problem, you are 75m high because you are...

Please help me in this question i dint understand about the dot product in A.divergent gradient.

I can't understand it :(

A 50 loop circular coil has a radius of 0.03 m. It is oriented so that the field lines of a magnetic field are normal to the area of the coil. Suppose that the magnetic field is varied...

please tell me i wan to know

You walk 33 miles to the north, then turn 60° to your right and walk another 45 m. How far are you from where you originally started?

A boy jumps with a velocity of magnitude 20.0 m/s at an angle of 25.0° above the horizontal. What is the horizontal component of the boy's velocity?

A vector in the xy-plane has an x component of -7.50 units. What must be the y component of this vector so that it's magnitude is 10.0 units?

A barefoot field-goal kicker imparts a speed of 30 m/s to a football at rest. If the football has a mass of 0.50 kg and time of contact with the football is 0.025 s, what is the force exerted on the...

An automobile of mass 2 000 kg moving at 30 m/s is braked suddenly with a constant braking force of 10 000 N. How far does the car travel before stopping?

Question 1 A Geiger counter gets 8000 counts per minute from a certain source with a half-life of 5 years. How many years until its activity is 1000 counts per minute? Question 2 The...

I am not sure what equation to use to solve this. I understand this is fairly simple, but just want to make sure I am doing it right.

A 2.95-kg object is moving in a plane, with its x and y coordinates given by x = 3t2 − 2 and y = 4t3 + 3, where x and y are in meters and t is in seconds. Find the magnitude of the net force acting...

Light with a frequency of 6.1*10^14 Hz is measured from a star. This type of star is known to produce light with a frequency of 6.0*10^14 Hz. How fast is the star moving away from toward Earth?

A 2.10-mole sample of an ideal gas is allowed to expand at a constant temperature of 278 K. The initial volume is 14.5 L and the gas performs 945 J of work. What is the final volume of the container...

Assume that a satellite orbits earth 230,000 m above its surface. given that the mass of earth is 5,97 x 10^24 kg, and the radius of earth is 6.38 x 10^6 m what is the satellite's period?

A slotted link is rotating about fixed pivot O with a counterclockwise angular velocity of 3 rad/s, and a clockwise angular acceleration of 2 rad/s2. The movement of the link is causing a rod to slide...

It ask you how many seconds are there in 1 year

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