Calculate the total heat energy in Joules needed to convert 20 g of substance X from -10°C to 70°C?

Aman tries to push a box of mass 4 kg with a force of 5 n but the box remains stationary if the coefficient of static friction is 0.45, what is the value of the maximum force of friction?

Which of the following harmful chemicals are found in tobacco smoke? a. carbon monoxide b. carbon dioxide c. nicotine b. carbon dioxide d. both a and c

Work out sian speed for the first 30 minutes of her journey. give your answer in km/h.