Is there no friction on ice? When a skate moves over the surface of ice, the friction between the skate and the ice generates heat that melts the outermost layer of ice. But ice is still slippery even when you’re standing still. If you stand on ice without moving, no friction exists to generate heat, […]
How do you interpret a chi square test?
How do you interpret a chi square test? For a Chi-square test, a p-value that is less than or equal to your significance level indicates there is sufficient evidence to conclude that the observed distribution is not the same as the expected distribution. You can conclude that a relationship exists between the categorical variables. What […]
What are the two factors of gravity and how do they affect gravitational pull?
What are the two factors of gravity and how do they affect gravitational pull? Newton’s law also states that the strength of gravity between any two objects depends on two factors: the masses of the objects and the distance between them. Objects with greater mass have a stronger force of gravity between them. Objects that […]
Does friction depend on surface area?
Does friction depend on surface area? Friction is a contact force when two surfaces interact. Notice that both of these friction formulas ONLY depend on the coefficient of friction and the normal force. It does not depend the area of contact, it doesn’t depend on the sliding speed. Is friction dependent on mass? Friction DOES […]
What are two differences between a compound and mixture?
What are two differences between a compound and mixture? Mixtures are the impure substances, made up of two or more physically mixed substances and not in the fixed ratio. Compounds are the pure form, made up of two or more chemically mixed elements and in a fixed ratio. Mixtures do not have meting or boiling […]
What are the 4 main provisions of the Endangered Species Act?
What are the 4 main provisions of the Endangered Species Act? The Endangered Species Act (“ESA”) prohibits importing, exporting, taking, possessing, selling, and transporting endangered and threatened species (with certain exceptions). ESA also provides for the designation of critical habitat and prohibits the destruction of that habitat. Is the Endangered Species Act successful? The US […]
Which planet has the slowest orbital velocity?
Which planet has the slowest orbital velocity? If Pluto had maintained its planet status, it would have the slowest orbital speed at just 10,438 miles per hour. Instead, Neptune again wins with an orbital speed of 12,148 miles per hour. Compared to Earth’s 66,621 miles per hour, Neptune is practically sluggish. What season is Earth’s […]
What is the velocity of star?
What is the velocity of star? In the Milky Way, stars usually have velocities on the order of 100 km/s, whereas hypervelocity stars typically have velocities on the order of 1000 km/s. Most of these fast-moving stars are thought to be produced near the center of the Milky Way, where there is a larger population […]
What happens if I put a balloon in the freezer?
What happens if I put a balloon in the freezer? What would happen if you put a balloon in the freezer? As the air cools it compresses and therefore exerts less pressure on the balloon. If cold enough your balloon will be visibly deflated. If you then bring back to room temperature it will return […]
Which describes the first law of thermodynamics?
Which describes the first law of thermodynamics? The First Law of Thermodynamics states that heat is a form of energy, and thermodynamic processes are therefore subject to the principle of conservation of energy. This means that heat energy cannot be created or destroyed. “So, it’s a restatement of conservation of energy.” What is the second […]