Which of the following statements presents a testable hypothesis? (a) more people watch basketball games than nhl games. (b) nascar is a popular sport in the southeastern states. (c) calcium is an essential nutrient for our bones. (d) if there is a relation between the wavelength of light and the photosynthesis rate, then light of different colors will cause the plant to make different amounts of oxygen. (e) newton's law of gravitation explains the force that holds the solar system together.

Amass attached to a spring is displaced from its equilibrium position by 5cm and released. the system then oscillates in simple harmonic motion with a period of 1s. if that same mass–spring system is displaced from equilibrium by 10cm instead, what will its period be in this case? a mass attached to a spring is displaced from its equilibrium position by and released. the system then oscillates in simple harmonic motion with a period of . if that same mass–spring system is displaced from equilibrium by instead, what will its period be in this case? a) 0.5sb) 2sc) 1sd) 1.4s

The energy equivalent of the rest mass of an electron is

An electron moves with a constant horizontal velocity of 3.0 × 106 m/s and no initial vertical velocity as it enters a deflector inside a tv tube. the electron strikes the screen after traveling 26 cm horizontally and 19 cm vertically upward with no horizontal acceleration. what is the constant vertical acceleration provided by the deflector? (the effects of gravity can be ignored.)