Why is it important to describe both magnitude and direction of a quantity such as velocity

What happens to energy when a solid changes into a liquid?

Ionic solutes are considered strong electrolytes. What does this mean for the conductivity of the solution? a. Strong electrolytes dissolve and completely dissociate in water providing charged ions to conduct electricity. b.

A book on a 2 meter high self has 20 joules of potential energy. what is the mass of this book?

A ball is thrown 20.0 m/s at an angle of 40.0° with the horizontal. Assume the ball is thrown at ground level. A. How long does it take the ball to reach the wall? B. At what height does the ball hit the wall? C.

The transfer of a section of dna from one organism into the dna of a another organism by scientists is called

550 g of water at 105°C is poured into an 855 g aluminum container with an initial temperature of 11°C. The specific heat of aluminum is 900 J / (kg K).

what occurs when the soccer ball contacts the hands or arm of any player on the field except the goalkeeper?

Sand on a beach is covered by other layers of sand over time. The extra layers compress the first layer, packing it tighter and tighter. Over time, the bottom layers of sand have formed into sandstone, with colored bands showing the different layers.

How do i solve A sound wave has a frequency of 658 Hz in air and a wavelength of 0.46 m. What is the temperature of the air? Assume the velocity of sound at 0◦C is 331 m/s. Answer in units of ◦C

How has the space program affected Florida's culture