Question
Ratio of speed of boat in downstream and speed of stream
is 4:3, if speed of current is 6 km/hr, then find distance travelled (in km) upstream in 7 hours.Solution
Let speed of downstream and speed of stream be 4x and 3x respectively. Speed of current => 3x = 6 => x = 2 km/hr Downstream speed = 4 × 2 = 8 km/h Speed of boat = 8 - 2 = 6 km/hr Upstream speed = 6 - 2 = 4 km/h Distance travelled upstream in 7 hr = 7 × 4 = 28 km
The Pointing vector of electromagnetic waves has the same dimensions as that of:
A train runs along an unbanked circular track of radius of 10 m at speed of 36 km/h. The mass of the train is 16 kg.
What is the an...
A potentiometer is an accurate and versatile device to make electrical measurements of E.M.F. because the method involves:
An ant can see objects all around it due to the presence of which type of eyes?
When a liquid is heated in a container, which of the following processes primarily causes the heat transfer within the liquid?
The apparent weight of a person in a lift moving downward with uniform acceleration is:
Which of the following correctly ranks molecular speeds at a fixed temperature?
Two blocks of masses 2 kg and 4 kg are connected by a light spring (k = 300 N/m) and placed on a smooth horizontal surface. The spring is compressed by ...
A string of length L is fixed at both ends. It supports a standing wave with 3 antinodes. If the speed of the wave on the string is v, what is the freq...
Two long parallel wires 2 cm apart carry 5 A and 3 A currents in the same direction. What is the force per unit length on one wire?
Relevant for Exams:
