A box of m1=74.8kg is on frictionless horizontal surface. The mass is pulled to left by rope which exerts a F of T1. A box of m2=48.5kg sits on top of m1. Its pulled by F T2=79.3N that makes an angle of 24.2° with the horizontal. the coefficient of static friction of the two masses is μ=0.554. Given that the blocks are in equilibrium, What is T1?

The energy released by a chemical reaction can be measured using a calorimeter. when barium hydroxide octahydrate crystals are reacted with dry ammonium chloride inside of a coffee cup calorimeter, the temperature of the 18.00 g of water in the calorimeter decreases from 30.0°c to 8.0°c. the equation for calculating energy absorbed or released by a reaction is: where q is the energy released or absorbed, m is the mass of water in the calorimeter, cp is the specific heat of water, and δt is the observed temperature change. if the specific heat of liquid water is 4.19 j/g·°c, how much energy was absorbed by the reaction?

1. jay fills a wagon with sand (about 20 kg) and pulls it with a rope 30 m along the beach. he holds the rope 25° above the horizontal. the rope exerts a 20-n tension force on the wagon. how much work does the rope do on the wagon?

In a good thermo flask the main cause of heat loss is