An iron weight, suspended by a string, is motionless. The tension in the string is 4.75 newtons. What is the mass of the iron weight? A. 0.485 kilograms B. 4.75 kilograms C. 9.65 kilograms D. 10.0 kilograms E. 15.5 kilograms

•• al and bert are jogging side-by-side on a trail in the woods at a speed of 0.75 m/s. suddenly al sees the end of the trail 35 m ahead and decides to speed up to reach it. he accelerates at a constant rate of 0.50 m/s2, while bert continues on at a constant speed. (a) how long does it take al to reach the end of the trail? (b) once he reaches the end of the trail, he immediately turns around and heads back along the trail with a constant speed of 0.85 m/s. how long does it take him to meet up with bert? (c) how far are they from the end of the trail when they meet?

Asystem containing an ideal gas at a constant pressure of 1.22×10^5 pa gains 2140 j of heat. during the process, the internal energy of the system increases by 2320 j. what is the change in volume of the gas?

What are some important factors to consider when choosing a warm-up before your workout?