Wich of the following is a contact force?

a. - friction

b.-magnetism

c.-gravity

d.-electricity

How much heat energy (in megajoules) is needed to convert 7 kilograms of ice at - 9°C to water at 0°C? A. 2.48 MJ B. 2.13 MJ C. 3.26 MJ D. 3.09 MJ

Why did donald hings invent the walkie talkie?

If a sprinter has an average acceleration of 9.5 m/s2, how long does it take for the person to go from rest to 10 m/s

What is the net force acting on the child? 0 - 100 N O ON O100 N O 200 N

A police officer finds 60 m of skid marks at the scene of a car crash. Assuming a uniform deceleration of 7.5 m/s to a stop, what was the velocity of the car when it started skidding?

In what ways, would understanding the body positions, directions, and planes assist you with tasks related to the integumentary, skeletal/muscular, and digestive systems

Concave & convex lens of same mass & radii rotate about an axis passing through their centre & perpendicular to the plane which one will have greater mnment of inertia

Which of the following statements is true? A. Both chemical reaction rates and nuclear decay rates vary with the conditions of the reaction. B. Nuclear decay rates vary with the conditions of the reaction, but chemical reaction rates do not. C.

A star may form a black hole once it cannot?

Kai was 200 meters north of the library when he remembered he had to return some books to the library. It took him 200 seconds to do the round trip. Which best describes Kai's roundtrip?