A series of ocean waves, each 5.0 m from crest to crest, moving past the observer at a rate of 2 waves per second have wave velocity
(A) 2.5 m/s
(B) 5.0 m/s
(C) 8.0 m/s
(D) 10.0 m/s
1 Answers
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Shiva can type `x` words per hour while Sreevias can type `y` words per hour. Shiva works for 5 hours per day and Sreenvias works for 7 hours per day.
Correct Answer - `5x + 7y ge 700`
2 Answers 1 views
It has been found that the Sun’s mass loss is 4.34 × 10^9 kg per second. How much energy per second would be radiated into space by the Sun?
Given : Sun’s mass loss = 4.34 × 109 kg per second To find : Energy radiated per second into space by Sun Calculation : Δm = 4.34 × 109 kg per second Now, 1.66 × 10-27...
2 Answers 2 views
A 150 m long train is moving in north direction with a velocity of 5m/s and a parrot is also moving in north direction with a velocity of 10 m/s, then
Correct Answer - (i)`30sec (ii) 300m
2 Answers 1 views
An observer is travelling in west with velocity of 5 km/h and observes that wind is blowing in north with the velocity of `5sqrt(3)` km/h. Find out th
Correct Answer - 10 km/h,`30^(@)W" of "N`
2 Answers 7 views
An observer is travelling in east with a velocity of 2 m/s and observes that wind is blowing in north with a velocity of 2m/s. If observer doubles his
Correct Answer - `2sqrt(2)m//s` N-W
2 Answers 1 views
The radius of a circle is increasing uniformly at the rate of 0.3 centimetre per second. At what rate is the area increasing when the radius is 10 cm
Correct Answer - `(dA)/(dt) = 18.84 cm^(2)//s`
2 Answers 2 views
A body is moving with initial velocity 30 m/s. After certain time it acquires velocity of 40 m/s, then the velocity in middle of its journey is
Correct option is A) 25√2
2 Answers 2 views
You have collected the information about ocean weeds. Identify the ocean weed from given below names.
(B) Agar-Agar
2 Answers 1 views
If the wave number of the first line in the Balmer series of hydrogen atom is `1500cm^(-1)`, the wave number of the first line of the Balmer series of
Correct Answer - A `bar(v) = bar(v)_(H) xx z^(2)`
2 Answers 1 views
A body of mass `2kg` moving on a horizantal surface with an initial velocity of comes to rest after `2` second. If one wants to keep this body moving
Correct Answer - C `v=u+at,F=ma`
2 Answers 1 views