Recent questions in Physics

A projectile is thrown into space so as to have the maximum possible horizontal range =400m.Taking the point of projection as the origin,the co-ordinate of the point where the velocity of the projectile is minimum,are

asked Aug 13, 2014 by sreemathi.v

1 answer

A projectile can have the same range 'R' for two angles of projection.If $t_1$ and $t_2$ be the time of flights in the two cases,then the product of the two time of flights is proportional to

asked Aug 13, 2014 by sreemathi.v

1 answer

Two stones are projected with the same speed but making different angles with the horizontal.Their horizontal ranges are equal.The angle of projection of one is $\large\frac{\pi}{3}$ and the maximum height reached by it is 102 metre.Then the maximum height reached by the other in metre is

asked Aug 13, 2014 by sreemathi.v

1 answer

A soccer ball is kicked horizontally off a 22.0 meter high hill and lands a distance of 35.0 meters from the edge of the hill. Determine the initial horizontal velocity of the soccer ball.

asked Aug 13, 2014 by sreemathi.v

1 answer

A stone is thrown horizontally outward from the top of a bridge.The stone is released 19.6m above the street below.The initial velocity of the stone is 5.0m/s.Determine the magnitude and direction of the velocity of the projectile "just" before it strikes the street.

asked Aug 13, 2014 by sreemathi.v

1 answer

A projectile is fired with an initial speed of 113m/s at an angle of $60.0^{\large\circ}$ above the horizontal from the top of a cliff 49.0m high.Determine the total time it stays in the air,and horizontal range of the projectile.

asked Aug 13, 2014 by sreemathi.v

1 answer

The relation between time t and distance $x$ is $t= ax^2+bx$ where a and b are constants . The acceleration is

asked Aug 13, 2014 by meena.p

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A projectile is fired with an initial speed of 113m/s at an angle of $60.0^{\large\circ}$ above the horizontal from the top of a cliff 49.0m high.Determine the tome to reach maximum height,maximum height above the base of the cliff reached by the projectile.

asked Aug 13, 2014 by sreemathi.v

1 answer

Five balls A,B,C,D and E are projected with the same speed making angles of $10^{\large\circ},30^{\large\circ},45^{\large\circ},60^{\large\circ},80^{\large\circ}$ respectively,with the horizontal.Which ball will strike the ground at the farthest point?

asked Aug 13, 2014 by sreemathi.v

1 answer

A spring gun placed on a table fires a steal ball at a $45^{\large\circ}$ angle above the horizontal.The ball leaves the muzzle of the gun 1.1m above the floor and travels 4.6m horizontally.Determine the total time that the ball is in the air.

asked Aug 13, 2014 by sreemathi.v

1 answer

In a particular laboratory experiment,a spring gun placed on a table fires a steal ball horizontally outward.A student determines that the ball starts 1.0m above the floor and travels 2.7m horizontally before it strikes the floor.Determine the time that the ball is in the air and initial velocity of the ball

asked Aug 13, 2014 by sreemathi.v

1 answer

The position of a particle as a function of time is given by equation: $x =2t^3-6t^2+12t+6$. The acceleration of the body is zero at

asked Aug 12, 2014 by meena.p

1 answer

The position of a particle moving along the $x$-axis ($x$ is in $m$) is given by $x = t^3 - 3t^2 + 2t$. Find the average speed of the particle in the interval $t=2\;s \rightarrow t = 4\;s$

asked Aug 12, 2014 by balaji.thirumalai

1 answer

The position of a particle moving along the $x$-axis ($x$ is in $m$) is given by $x = t^3 - 3t^2 + 2t$. Find the velocity of the particle at $t=2\;s$.

asked Aug 12, 2014 by balaji.thirumalai

1 answer

The time taken by a pendulum to complete 20 vibrations is $88.0 $ second. The time period of the pendulum is

asked Aug 12, 2014 by meena.p

1 answer

A system takes $70.40 \;seconds$ to complete 20 oscillations. the time period of the system is :

asked Aug 12, 2014 by meena.p

1 answer

If the value of the resistance is $10.845 \Omega$ and the value of the current is $ 3.23$ ampere, then the potential difference is $35.02935$ volt. Its value in correct significant figures would be

asked Aug 12, 2014 by meena.p

1 answer

The mass of a box is $23\;g$ . Two gold pieces , each of mass $0.035\;g$ , are placed in it. The total mass of the box and gold pieces is

asked Aug 12, 2014 by meena.p

1 answer

A current of $2.34 $ ampere flows in a resistance of $11.111111 \Omega$ The potential difference across the given resistance with due to regard for significant figures is

asked Aug 12, 2014 by meena.p

1 answer

The radius of a wire is $0.24 \;mm$ . Then its area of cross- section by taking significant figures into consideration is

asked Aug 12, 2014 by meena.p

1 answer

The length of a cube is $ 2.1 \times 10^{-2}\;m$ . The volume in significant figures will be

asked Aug 12, 2014 by meena.p

1 answer

There are atomic clocks capable of measuring time with an accuracy of 1 part in $10^{11}$. If two such clocks are operated with precision , then after running for $5000\;year$ these will record.

asked Aug 12, 2014 by meena.p

1 answer

The effective length of a simple pendulum is the sum of the following three length of string , radius of bob, length of hook. In a simple pendulum experiment , the length of the string, as measured by a metre scale is $92.0\;cm$ . The radius of the bob combined with the length of the hook, as measured by a vernier callipers is $2.15\;cm$ The effective length of the pendulum is

asked Aug 12, 2014 by meena.p

1 answer

A body covers a certain distance x in equal thirds - the first third of distance with speed v$_1$, the second third with a speed of v$_2$ and the last third with a speed of v$_3$. What is the average speed of the body over time?

asked Aug 11, 2014 by balaji.thirumalai

2 answers

A body travels first half a distance with velocity v$_0$. The remaining distance was covered with velocity v$_1$ for half the time and v$_2$ for the remaining time. Find the average velocity over the whole time of motion?

asked Aug 11, 2014 by balaji.thirumalai

1 answer

Consider the following one-dimensional motion.A spacecraft drifts through space at constant velocity. Which of the following statements are true?

asked Aug 11, 2014 by balaji.thirumalai

1 answer

Consider the following one-dimensional motion. A race car starts from rest and speeds up to 100 m/s. Which of the following statements are true?

asked Aug 11, 2014 by balaji.thirumalai

1 answer

Consider the following one-dimensional motion. A ball thrown directly upward rises to a highest point and falls back into the thrower’s hand. Which of the following statements are true?

asked Aug 11, 2014 by balaji.thirumalai

1 answer

You start from a point and your first move is 5 m at an angle of 53.1$^{\circ}$. Your second move was 6 m along the x-axis and some unknown distance along the y-axis. Your third move was some unknown distance along the x-axis and -3 m along the y-axis. If you ended up at a point 5.39 m from where you started and 21.8$^{\circ}$ below the x-axis, calculate the unknown components of your second ($y_2$) and third ($x_3$) moves .

asked Aug 11, 2014 by balaji.thirumalai

1 answer

A jet plane takes off with a velocity of 300 km/s at a bearing of 60$^{\circ}$. A wind with a velocity of 80 km/s NW blows it off course. What is the resultant velocity of the jet plane (magnitude and the bearing)?

asked Aug 11, 2014 by balaji.thirumalai

1 answer

A hiker begins a trip by first walking 25 km southeast from her car. She stops and sets up her tent for the night. On the second day, she walks 40 km in a direction 60$^{\circ}$ north of east, at which point she discovers a forest ranger’s tower. Write the total displacement in unit vector form.

asked Aug 11, 2014 by balaji.thirumalai

1 answer

A car travels 20 km due north and then 35 km in a direction 60$^{\circ}$ west of north as shown below. Find the magnitude and direction of the car’s resultant displacement.

asked Aug 11, 2014 by balaji.thirumalai

1 answer

A ball is dropped from the roof of a building . An observer notes that the ball takes $0.1$ s to cross over a window 1 m in height . After crossing the window , the ball takes another 1.00 s to come to the bottom of the building . What is height of the building and how high is the window. Take $g=10 ms^{-2}$

asked Jul 25, 2014 by meena.p

1 answer

A body X is dropped from a vertical height of 200 m. Exactly at the same instant another body -Y is projected vertically upwards with a velocity of $100 ms^{-1}$. When and where the two bodies X and Y meet?

asked Jul 25, 2014 by meena.p

1 answer

Drops are falling at regular intervals of time from the roof of a building 16 m high. If the first drop reaches the ground at the instant the fifth drop start falling, find the heights of the various drops at the instant the first drop reaches the ground ?

asked Jul 25, 2014 by meena.p

1 answer

A juggler is maintaining four balls in motion, making each in turn to rise to height of 20 m.Where will other three balls be at the instant, When one is just leaving his hand? $g= 10ms^{-2}$

asked Jul 25, 2014 by meena.p

1 answer

A juggler is maintaining four balls in motion, making each in turn to rise to height of 20 m. With what velocity does he project them ?

asked Jul 25, 2014 by meena.p

1 answer

A body is projected vertically upward with a velocity $20 ms^{-1}$ . Find the distance travelled by it in 3 s. Take $g=10ms^{-2}$.

asked Jul 25, 2014 by meena.p

1 answer

A particle is projected vertically up and it reaches a 15 cm high mark at certain instant. After 4 seconds from this instant the particle crosses this mark again in its downward journey. What is the initial velocity of projection of this particle? $(g= 10 ms^{-2})$

asked Jul 25, 2014 by meena.p

1 answer

A body travels 2 m in the first two seconds and $2.2 \;m$ in the next four seconds. What will be its velocity at the end of the seventh second from the start, if acceleration is constant .

asked Jul 18, 2014 by meena.p

1 answer

A Car is able to stop with a uniform retardation of $8 ms^{-2} $ and the driver of the car can react to an emergency in 0.6 s. Calculate overall stopping distance of the car if the speed of car is $72 \;km\;h^{-1}$

asked Jul 18, 2014 by meena.p

1 answer

Straight from rest and moving with a constant acceleration , a body covers certains distance L in time t. What is the time taken by the body to cover the second half portion of this journey ?

asked Jul 18, 2014 by meena.p

1 answer

Telegraphic poles along a straight railway track are spaced at regular intervals of $90\;m$. A passenger in the train observes the successive pole pass at time intervals of 3 and 2 seconds respectively , find the acceleration of the train assuming it to be uniform .

asked Jul 18, 2014 by meena.p

1 answer

A train travels first one third of the distance on a straight track with velocity$10km h^{-1}$ next one third with velocity $20 kmh^{-1}$ and the last portion with velocity $60 kmh^{-1}$. What is the average velocity of the train for the whole journey ?

asked Jul 18, 2014 by meena.p

1 answer

If a ball is thrown vertically upwards with speed u, the distance covered during the last t second of its ascent is

asked Jul 18, 2014 by meena.p

1 answer

A particle is dropped vertically from rest from a certain height. Time taken by it to fall through successive distance of one metre each will be :

asked Jul 18, 2014 by meena.p

1 answer

A stone is thrown vertically up from the top of a tower with some initial velocity and it arrives on the ground after $t_1$ seconds. Now if the same the stone is thrown vertically down from the top of the same tower with the same initial velocity, it arrives on ground after $t_2$ seconds. In how much time will the stone take to reach the ground if it is dropped from the same tower?

asked Jul 17, 2014 by meena.p

1 answer

A particle is projected vertically upwards . It attains a height h after 2 seconds and again after 10 seconds . The speed of the particle at the height h is numerically equal to

asked Jul 17, 2014 by meena.p

1 answer

A body is projected vertically upwards. If $ t_1$ and $t_2$ be the times at which it is at height h above the point of projection while ascending and descending respectively. then h is,

asked Jul 17, 2014 by meena.p

1 answer

If the speed of a truck is reduced to one third of its original value, the minimum distance required to stop will be

asked Jul 17, 2014 by meena.p

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