The Gulf of Tonkin resolution gave LBJ the power to send troops to Vietnam without officially declaring war. The US was desperate to try and prevent the spread of communism and congress allowed this unprecedented power to be given to the president. After the war, Congress realized that was too much power to give the president as well as the war ending in failure, and enacted the War powers act. This act limited the president's power in case of a future dispute.
Explanation:
It is given that,
Charge acquired on rubbing a balloon on your hair, q = -1.93 C
If you move the balloon 25 cm away from your hair, r = 25 cm = 0.25 m
Electric field acting between the balloon and your hair is given by :
k = electrostatic constant
or
Hence, this is the required solution.
To solve this problem, apply the concepts related to the calculation of the work performed according to the temperature change (in an ideal Carnot cycle), for which you have to:
Where,
C = Heat capacity of the Brick
= Cold Temperature
= Hot Temperature
Integrating,
Our values are given as
Replacing,
Therefore the work perfomed by this ideal carnot engine is 58kJ
Answer:
Question 1: 189 joules
Question 2: 2.25 watts
Question 3: 405 joules
Question 4: 0.00125 watts
Question 5: 450000 joules
Explanation:
question 1:
Volt=1.5v
Resistance =5 ohms
Time=7 minutes
Time=7 x 60
Time=420 seconds
Current =voltage ➗ resistance
Current =1.5 ➗ 5
Current =0.3 amps
Energy=current x voltage x time
Energy=0.3 x 1.5 x 420
Energy =189 joules
Question 2:
Current =0.5 amps
Voltage =4.5v
Power=current x voltage
Power=0.5 x 4.5
Power=2.25 watts
Question 3:
Current=0.5 amps
Voltage=4.5v
Time =3 minutes
Time =3x60
Time =180 seconds
Energy=current x voltage x time
Energy=0.5 x 4.5 x 180
Energy =405 joules
Question 4:
Resistance=50 ohms
Current =5 milliamps
Current =5/1000
Current =0.005 amps
Power =current x current x resistance
Power=0.005 x 0.005 x 50
Power=0.00125 watts
Question 5:
Power =50 watts
Time=2.5 hour
Time=2.5 x 60 x 60
Time =9000 seconds
Energy=power x time
Energy=50x9000
Energy=450000 joules