Recent questions tagged class11

The police are chasing a bank robber.While driving at 50m/s,they fire a bullet to shoot out a tire of his car.The police gun shoots bullets at 300m/s.What is the bullet's speed as measured by a TV camera crew parked beside the road?

asked Aug 13, 2014 by sreemathi.v

1 answer

Two bodies are projected at angles $\theta$ and $(90^{\large\circ}-\theta)$ with the horizontal at the same speed.The ratio of their maximum heights is

asked Aug 13, 2014 by sreemathi.v

1 answer

An oblique projectile has the smallest speed on its trajectory when

asked Aug 13, 2014 by sreemathi.v

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The greatest height to which a man can throw a ball is h.What is the greatest distance to which he can throw the ball?

asked Aug 13, 2014 by sreemathi.v

1 answer

Two projectiles are thrown with the same initial velocity at angles $\alpha$ and $(90^{\large\circ}-\alpha)$ with the horizontal.The maximum heights attained by them are $h_1$ and $h_2$ respectively.Then $\large\frac{h_1}{h_2}$ is equal to

asked Aug 13, 2014 by sreemathi.v

1 answer

A body is thrown with a velocity of $10ms^{-1}$ at an angle of $60^{\large\circ}$ with the horizontal.Its velocity at the highest point is

asked Aug 13, 2014 by sreemathi.v

1 answer

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

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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

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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

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

asked Aug 12, 2014 by meena.p

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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

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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

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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

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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

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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

IQ of a person is given by the formula $IQ= \large\frac{MA}{CA} $$ \times 100$ Where MA is a mental age and CA is chronological age. If $80 \leq IQ \leq 140$ for a group of 12 years old children find the range of their mental age .

asked Aug 5, 2014 by meena.p

1 answer

How many liters of water will have to be added to $1125$ liters of the $45\%$ solution of acid so that the resulting mixture will contain more than $25 \%$ but less than $30\%$ acid content ?

asked Aug 5, 2014 by meena.p

1 answer

A solution of $ 8 \%$ basic acid is to be diluted by adding $ 2 \%$ boic acid. Solution to it. The resulting mixture is to be more than $4 \%$ but less than $6 \%$ boric acid. If we have 640 litres of $8^{\circ} \%$ Solution , how many litres of $2 \%$ solution is to be added ?

asked Aug 5, 2014 by meena.p

1 answer

A solution is to be kept between $68^{\circ} F$ and $ 77^{\circ} F$ . What is the range in to temperature in degree ceisius (C) if the ceisius (C) if the ceisius / Fahrenheit (F) conversion. formula is given by $F= \large\frac{9}{8} $$c +32?$

asked Aug 5, 2014 by meena.p

1 answer

Solve the inequalities and represent the solution graphically on number line. $ 5(2x-7) - 3(2x+3) \leq 0 ; 2x+19 \geq 6x+47 $

asked Aug 5, 2014 by meena.p

1 answer

Solve the inequalities and represent the solution graphically on number line. $ 3x-7 > 2(x-6) ; 6-x > 11-2x $

asked Aug 5, 2014 by meena.p

1 answer

Solve the inequalities and represent the solution graphically on number line. $ 2(x-1) < x+5 ; 3(x+2) > 2-x $

asked Aug 4, 2014 by meena.p

1 answer

Write the negation of the statement " There exists a number $x$ such that 0<$x$<1."

asked Aug 4, 2014 by rvidyagovindarajan_1

1 answer

Write the negation of the statement " For every real number $x$, either $x$ is >1 or <1."

asked Aug 4, 2014 by rvidyagovindarajan_1

1 answer

Write the negation of "All cats scratch."

asked Aug 4, 2014 by rvidyagovindarajan_1

1 answer

Write the negation of "For every positive real number $x$, the number $x+1$ is also positive."

asked Aug 4, 2014 by rvidyagovindarajan_1

1 answer

Write the negation of "For every positive real number $x$, the num ber $x+1$ is also positive."

asked Aug 4, 2014 by rvidyagovindarajan_1

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