Question
Nikita covered a total distance of 400 km — partly by
airplane at 200 km/h and partly by bus at 80 km/h. If she took 3.5 hours to reach, how many kilometers did she travel by airplane?Solution
ATQ,
Let airplane distance = d km
Then, by bus = 400 - d km
Time equation: d / 200 + (400 - d) / 80 = 3.5
LCM of 200 and 80 = 400
Or, (2d + 5(400 - d)) / 400 = 3.5
(2d + 2000 - 5d) / 400 = 3.5
(2000 - 3d) / 400 = 3.5
Multiply both sides:
2000 - 3d = 1400
3d = 600
d = 200
Distance by airplane = 200 km
When heated from 0° to 10°C volume of a given mass of water will -
________ are the elements of group 18.
A conducting rod of length 0.2 m is rotated with angular velocity 10 rad/s about one end in a uniform magnetic field of 0.5 T perpendicular to the plane...
What was invented by 'Zacharias Janssen'?
A dielectric placed between the plates of a capacitor increases its:
A capacitor filled with dielectric constant K is connected to a battery. If dielectric is removed, how much charge flows back?
The speed of a fast moving electron, having total energy of 2 MeV, is nearly:
What is the escape velocity from Earth?
The balance point in a potentiometer for a cell of emf 1.5 V is 60 cm. If a resistance of 5 Ω is connected in parallel with the cell and the new balanc...
What is the main effect of increasing the temperature of a gas at constant volume?
