What is the first sing of dehydration

Heat from the sun reaches earth to a. radiation b. convection c. conduction

Name three different units of energy used to measure heat and describe what type of situations each is usually used.

Astudent pushes on a 20.0 kg box with a force of 50 n at an angle of 30° below the horizontal. the box accelerates at a rate of 0.5 m/s2 across a horizontal floor. what is the value of the normal force on the box? 200 n 243 n 156 n 225 n