Part 1: True/False. Write Tor F on the line for each statement. 1. In the 1990's a computer was so large that it would have filled a classroom.
2. Mass is the amount of matter an object has.
3. A hypothesis is unreasonable guess made to explain a problem.
4. The metric unit used to measure volume is liter.
5. The metric unit used to measure length is gram.
6. The first step usually followed to solve a scientific problem is theory.
7. The explanation used to answer or solve scientific problems is the
hypothesis.
8. Circular motion moves in a straight line.
9. Translational motion, rotational motion, and vibrational motion are the three
basic kinds of motion.
10. Velocity describes the distance in which an object is moving.
11. Friction between surfaces can be reduced by smoothing the surfaces or by
using a lubricant.
12. Deceleration is the rate of decrease in velocity.
13. Distance multiplied by time is known as speed.
14. Centripetal force keeps an object moving in a circle.
15. Objects traveling along a rough surface slow down because of inertia.
16. When the forces acting on an object are balanced the object is in equilibrium.
17. When a bus stops suddenly, the passengers keep moving ahead.
18. A force is needed to change an object's direction of motion.
19. Torque is the imaginary line around which an object rotates.
20. When the forces acting on an object are balanced, the object is in
equilibrium.

In a steady-flow steam power plant system, two adiabatic high-pressure and low-pressure turbines ane used to generate power. superheated steam enters the high-pressure turbine at 8 mpa and 550°c. the steam expands in the high-pressure turbine to a saturated vapor at 3 mpa. in order to increase the powe generation of the power plant, another steam turbine working in a lower pressure ranges is deployed. the outlet vapor from the first turbine is heated up at a boiler to the temperature of 500 c at the constant pressure of first turbine's outlet (3 mpa). then, the vapor enters the second turbine and produces extra work. the exit conditions of the second turbine are 5o kpa and 90 percent quality. if the total power output of the power plant is 25 mw, determine a) the mass flow rate of the water (kg/s). b) heat transfer rate in the boiler (mw). (30 points) 3 mpa 00 c 8 mpa s0 c high pres turbine low pres boiler turbine 50 kpa 3 mpa 09 saturated vapor t heat engine, shown in the figure, operates between high temperature and low temperature of through a heat 4. a carnot tn and tu respectively. this heat engine receives energy from a heat reservoir at t exchanger where the heat transferred is proportional to the temperature difference as ? = k (z,-7, ). it rejects heat at a given low temperature tl. to design the heat engine for maximum work output, find the high temperature, th, as a function of tes and t. (15 points) qe

How many hydrogen (h) atoms are in one molecule of sulfuric acid, h2so4? (1 points) 1 2 4 7

Science and technology are interdependent. advances in one lead to advances in the other. give an example of this phenomenon.