A block of mass m = 5.9 kg slides from left to right across a frictionless surface with a speed It collides with a block of mass M that is at rest. After the collision, the 5.9-kg block reverses direction, and its new speed is The block of mass M travels to the right at a speed V of 3.8 m/s. What is M? 7.9 kg

Explain why electric current cannot exist if a current doesn't have a voltage source.

Humidity is to blame for that muggy, steamy feeling you experience on some hot summer days. what gas in the atmosphere causes humidity? a) oxygen b) hydrogen c) nitrogen d) water vapor

In a particular chemical reaction, the energy of the reactants is 30 kj and the energy of the products is 5 kj. 
 the maximum energy of the system is 40 kj. sketch a potential energy diagram for this reaction. make sure to label the energy of the reactants, the energy of the products, the activation energy, and the enthalpy change for the reaction.