Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 9 Answered

A marble is dropped into a frictionless U tube. If the tube is semi circular with  mean radius 5 cm and mass of the ball 2 gram, then find its velocity at the bottom of the tube.
Asked by ayan1.chatterjee | 13 Jan, 2021, 08:47: AM
Expert Answer
Kinetic energy of marble is determined using conservation of energy .
 
Hence we equate the initial potential energy to kinetic energy of marble at bottom as given below.
 
( m g h ) = (1/2) m v2 ........................(1)
 
where m is mass of marble, g is acceleration due to gravity , h is vertical height of marble
from bottom of semi-circular tube and v is speed of marble at bottom of semi-circular tube .
 
h = radius of  semi-circular tube = 5 cm
 
Hence from eqn.(1) , we get ,  v = { 2 g h }1/2 = { 2 × 9.8 × 0.05 }1/2 ≈ 1 m/s
Answered by Thiyagarajan K | 13 Jan, 2021, 09:35: AM

Application Videos

Concept Videos

Multiple Choice Questions Practice Test Subjective Questions Webinar Subjective Questions Pre Board Assessment
Answered Unanswered My Questions My Answers
CBSE 9 - Physics
if u is an initial velocity v is final velocity of body and t is time taken by boddy to attain a velocity from u to v then find the value of acceleration A
Asked by Anushkamishra385123 | 14 May, 2023, 12:39: PM
ANSWERED BY EXPERT
CBSE 9 - Physics
can velocity be constant with acceleration?
Asked by adityatripathi84418 | 02 May, 2023, 10:29: PM
ANSWERED BY EXPERT
CBSE 9 - Physics
A boy throws a steel ball straight up. Consider the motion of the ball only after it has left the boy's hand but before it touches the ground and assume that forces exerted by the air are negligible. For these conditions, the force(s) acting on the ball is (are): a. A downward force of gravity along with a steadily decreasing upward force b. A steadily decreasing upward force from the moment it leaves the boy's hand until it reaches its highest point on the way down there is a steadily increasing downward force of gravity as the object gets closer to the earth c. Constant downward force of gravity along with an upward force that steadily decreases until the ball reaches it highest point on the way down there is only a constant downward force of gravity d. Constant downward force of gravity only
Asked by harshsrivastava8896606 | 17 Apr, 2023, 01:47: AM
ANSWERED BY EXPERT
CBSE 9 - Physics
For electric power transmission, copper or aluminium wire is used?
Asked by pramilam | 18 Mar, 2023, 08:54: PM
ANSWERED BY EXPERT
CBSE 9 - Physics
What is the SI Unit of "Intensity of Sound"?
Asked by manaskumarbiswasbrb | 04 Feb, 2023, 08:35: PM
ANSWERED BY EXPERT
CBSE 9 - Physics
explain human ear with lable diagram
Asked by sm6878261 | 12 Jan, 2023, 07:42: AM
ANSWERED BY EXPERT
CBSE 9 - Physics
What is sound 
Asked by ahirejay2020 | 07 Jan, 2023, 10:41: PM
ANSWERED BY EXPERT
CBSE 9 - Physics
why pressure increases with depth in fluid
Asked by sknv159357 | 05 Jan, 2023, 08:29: PM
ANSWERED BY EXPERT
CBSE 9 - Physics
An object starts from rest and travels 20m in first 2 s and 160 m in 4 s . Find its velocity 7 s after the start .
Asked by asyadav1230 | 20 Dec, 2022, 07:17: AM
ANSWERED BY EXPERT
CBSE 9 - Physics
Two points A and B are located on the floor of a room 30cm and 20cm away from a wall. The distance between the points parallel to the wall is 50cm. An insect is at moving on the floor at 5cm/s. It has to first reach a point C on the wall and then reach B such that AC and BC make equal angles with Normal to the wall at C. The time taken for this  motion will be
Asked by rajesh kumar | 21 Oct, 2022, 08:15: PM
ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt