When a person bends an arm a different muscle is used to bring it back to the original position. why can't the same muscle be used to both bend and unbend the arm?

Lithium (symbol: Li, no. of protons: 3, no. of neutrons: 4)

If the mass of a material is 41 grams and the volume of the material is 5 cm^3, what would the density of the material be? answer: Units:

What is the speed of a plane that traveled 1500 km in 2.5 hours? How far would that same plane travel in eight hours if it maintained a constant speed?

What are the three things that make up the Electricity Triad a. Electricity, Magnetism, Electrons C. Magnetism, Electrons, Motors b. Motion, Electricity, Magnetism d. Motors, Motion, Electrons

A steel piano string of mass per unit lenght 4*10-⁴kgm-¹ was struck, if the speed of the sound on the string is 300ms-¹. Calculate the tension ...

A car travels along eastward with a constant velocity. the magnitude of the acceleration of the car is

What is the weight of a 65 kg astronaut on mars?

When lava cools, what type of Rock forms?

A uniformly charged conducting sphere of 1.1 m diameter has a surface charge density of 6.2 µC/m2. (a) Find the net charge on the sphere. (b) What is the total electric flux leaving the surface of the sphere?

A blow-dryer and a vacuum cleaner each operate with a voltage of 120 V. The current rating of the blow-dryer is 12 A, while that of the vacuum cleaner is 5.7 A. Determine the power consumed by (a) the blow-dryer and (b) the vacuum cleaner.