Which of the following involves the emission of a particle that has the same mass of an electron with a positive charge.

a. alpha decay

c. positron emission

b. beta decay

d. nuclear forces

Select all that apply. In the future, scientists hope to: live underwater establish colonies in space breathe underwater using artificial gills continue encroaching on the oceans mine oil and other natural resources from the ocean floor

A car starts from rest and accelerates from u seconds until it reaches a speed of 10ms the car then travels at 10ms for 2u seconds. the diagram shows the speed time graph for journey.

Student A: As the skater moves along the track, some of her kinetic energy is converted to thermal energy, so she will lose energy, causing the total energy of the system to decrease.

2. Using examples to describe each term, differentiate among average, instantaneous, and uniform velocity.

Infrared radiation from the sun has a wavelength of 6200 nm. calculate the energy of one photon of that radiation

Ina shoots a large marble (Marble A, mass: 0.08 kg) at a smaller marble (Marble B, mass: 0.05 kg) that is sitting still. Marble A was initially moving at a velocity of 0.5 m/s, but after the collision it has a velocity of - 0.1 m/s.

The elements that touch the zigzag line ar classified as

The half-life for a 100-gram sample of radioactive element X is 5 days. How much of element X remains after 10 days have passed? A. 25 g B. 100 g C. 75 g D. 50 g

During a transit, a passes in front of its parent star, temporarily decreasing the star's brightness by a small amount.

How much of each food dollar goes to the producer