Which element's symbol could replace the question mark in

the diagram?

O boron (B)

O neon (Ne)

O rubidium (Rb)

O arsenic (As)

The Egyptians and Greek shared which belief about preparing for important dreams

Cu (s) + AgNO3 (aq) → Cu (NO3) 2 (aq) + Ag (s) The unbalanced equation for the reduction of silver nitrate by copper is shown here. What is the coefficient for Cu (NO3) 2 in the balanced equation?

A 0.71 kg spike is hammered into a railroad tie. The initial speed of the spike is equal to 3.8 m/s. If the tie and spike together absorb 38.

No interior de um calorímetro de capacidade térmica 6 cal/°C encontram-se 85 g de um líquido a 18°C. Um bloco de cobre de massa 120 g e calor específico 0,094 cal/g°C, aquecido a 100°C, é colocado dentro do calorímetro.

What is translational kinetic energy?

A skater wearing in - line skates (no friction) is standing in the middle of the aisle inside a bus and is not holding on to anything.

A group of engineers is building a parabolic satellite dish whose shape will be formed by rotating the curve y=ax2 about the y-axis.

The movement of thermal energy from hot to cold materials is called

An object initially at rest explodes in two fragments of masses 5 kg and 7.5 kg that move in diametrically opposite directions. If the speed of the first fragment is 8.1 m/s, find the internal energy of the explosion.

Blank the constant velocity of a falling object when the force of air resistance is equal to the force of gravity