A mother pats a child every time he throws a chocolate wrapper in the dustbin. This is an example of (A) Observational Learning (B) Negative Reinforcement (C) Spontaneous recovery (D) Positive Reinforcement

Thick fuild in sinuses

When ultraviolet light with a wavelength of 400 nm falls on a certain metal surface, the maximum kinetic energy of the emitted photoelectrons is measured to be 1.10 ev.

The x and y component of a force are 2 and - 3N the force is A) 2i-3j B) 2i+3j C) - 2i-3j D) 3i+2j

A 15.0 kg sphere is at the origin and a 7.00 kg sphere is at x=20cm. At what position on the x-axis could you place a small mass such that the net gravitational force on it due to the spheres is zero?

How do objects appear to have color

A 5.90-g lead bullet traveling at 410 m/s is stopped by a large tree. If half the kinetic energy of the bullet is transformed into internal energy and remains with the bullet while the other half is transmitted to the tree, what is the increase in

How do you scientists determine the number of neutrons in an isotope of an atom?

Why is energy efficiency important to society's need to be efficient with energy usage?

A wave has a wavelength of 9 mm and a frequency of 14 hertz. What is its speed?

Where would you weigh the most? Mars Pluto Earth The Sun The moon