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The control panel on a spaceship contains a light that blinks every 2.00 s as observed by an astronaut in the ship. If the spaceship is moving past Earth with a speed of 0.750 c, determine the time interval between blinks as observed by a person on Earth.
c = 3times10^8
Roger is travelling with a speed of 0.800c relative to Mia. Roger travels for 50.0 s as measured on his watch.
Calculate the elapsed time on Mia’s watch during this motion.
c = 3.0 ×
108
1.5 molar,
50 mL nitric acid solution
Volume of solute, mass solute, volume of water
A coal contains 78% carbon, 4% hydrogen, 2% oxygen, 1.8%
sulphur and rest as non-combustibles.
Calculate:
(i) Gross calorific value of the coal in GJ/ton using Dulong’s Formula
337 C + 1442 [H – (O/8)] + 93 S kJ/kg
where C, H, O and S are percentages of carbon, Hydrogen, oxygen and
sulphur respectively.
(ii) Amount of coal needed per day to burn in a 10 MW power plant
working with 32% thermal efficiency (Given 1 kWh = 3.6 MJ).
Write a user defined method named getMark that can be used to get a valid mark from the user.
Your method must continuously ask the user for a mark, until a valid mark is entered (valid marks
are between 0 and 100). If a user enters an invalid mark, display an error message before asking
for a valid mark to be entered. The method must return the valid value to the calling program.
Write a user defined method named isPass that can be used to determine whether a mark is a
pass mark (greater or equal to 50). The method must take as input a mark, and return a boolean,
indicating whether the mark was a pass mark.
Write a program that reads in 5 marks by using the getMark method to ensure that valid marks are
processed. You need to calculate the sum and the average of the marks. Your program must also
use the isPass method to determine the number of pass marks entered. When the 5 marks have
been processed you need to display the sum, average and number of passes (from these marks).
Describe how neurotoxic venom affects the nervous system?
The mean NAT scores of Grade 10 students is 65. Sixty (60) students were chosen and
found that the standard deviation of their scores is 5. What is the probability that their
mean is between 64 and 67?
Consider A = <0,4,2> , B = <6,-1,0> , and C = <3,0,1>. Find scalars a, b and c such that aA + bB = (c - 1)C.
.
The Smith Trucking Company claims that the average weight of its delivery trucks when fully loaded is 6000 pounds with a standard deviation of 120 pounds. 36 trucks are selected at random and their weights recorded. Within what limits will the average weights of 90% of the 36 trucks lie?
Although neither side won the Battle of Coral Sea, how did the Americans and Japanese benefit?
