Which of the following pure elements exist as liquids at normal earth temperatures? bromine nitrogen mercury gold oxygen

Aplane travels 1000 miles in 5 hours .what is the planes average speed?

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

Which of the following changes will result in a stronger electromagnet? a. using fewer coils of wire b. using a higher voltage c. using a shorter nail d. using a longer wire