Which group on the periodic table contains only metals?
the left-hand side of the table begins with group 1 element. group 1 elements begin with hydrogen. group 2 elements begin with beryllium. group 3 through group 12 are in the center of the table. the top row of these element groups include the elements scandium, titanium, vanadium, chromium, manganese, iron, cobalt, nickel, cooper, and zinc. on the right side of the periodic table are found groups 13 through 18. group 13 begins with boron. group 14 beings with carbon. group 15 begins with nitrogen. group 16 beings with oxygen. group 17 begins with fluorine. group 18 begins with helium.
along the bottom

a.
the second group

b.
the last group

c.
along the top

d.

From center station, a train departs every 30 minutes on the fast line and a train departs every 50 minutes on the state line. if two trains depart from center station at 8: 00 a.m., one on each of the two lines, what is the next time that two trains, one on each line, will depart at the same time?

Complete the sentence to describe the law of conservation of energy. the law of conservation of energy states that energy cannot be created or , but it can be

For problems 1-3, consider a simple dc brush motor with a permanent magnet stator. with an an consider a simple dc brush motor with a permanent magnet ae supply voltage of 100 v, the no-load speed of the motor is 1000 rpm. this motor can provide a torque of 1.9 n-m at 800 rpm drawing a current of 2 a current are both zero at no load.) 1. with an armature supply voltage of 100 v, the motor is operated at 900 rpm. what is the motor torque? what is the mechanical power delivered by the motor? what is the current draw? what is the electrical power input? what is the energy efficiency of the motor? with an armature supply voltage of 100 v, the motor is operated at 1100 rpm (where it acts as a generator). what torque input is required? what mechanical power is required what current is generated? what is the electrical power generated? what is the energy efficiency of the motor acting as a generator? 2. with an armature supply voltage raised to 120 v, the motor is operated at 1000 rpm. what is the no-load speed? what is the motor torque? what is the mechanical power delivered by the motor? what is the current draw? what is the electrical power input what is the energy efficiency of the motor? 3.