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American National Curriculum

Grade 11

Solution for Grade 11

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The flow of liquid is laminar or stream -line is determined by

rate of flow of liquid
density of fluid
radius of the tube
coefficient of viscosity of lqiuid

Topic:

Mechanics

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Neglect atmospheric pressure and the density is varying linearly from

ρ_{1}

ρ_{2}

. The pressure at bottom is

$\frac{l e f t ( ρ _{1} + ρ _{2} i g h t ) g h}{2}$
$l e f t (ρ_{1} + ρ_{2} i g h t) g h$
$ρ_{1} g h$
$ρ_{2} g h$

Topic:

Mechanics

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Views: 5,285

Neglect atmospheric pressure and the density is varying linearly from

ρ_{1}

ρ_{2}

. The pressure at bottom is

$\frac{l e f t ( ρ _{1} + ρ _{2} i g h t ) g h}{2}$
$l e f t (ρ_{1} + ρ_{2} i g h t) g h$
$ρ_{1} g h$
$ρ_{2} g h$

Topic:

Mechanics

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Views: 5,913

A wooden stick of length

L

R

ρ

has a small metal piece of mass

m

(of negligible volume) attached to its one end. The minimum value for the mass

m

that would make the stick float vertically in stable equilibrium in a liquid of density

σ

is 2 \pi R^{2} L \rholeft(\sqrt{\frac{\sigma}{ \rho}}-1 ight) quad B) \pi R^{2} L \rholeft(\sqrt{\frac{2 \sigma}{ \rho}}-1 ight)egin{array}{ll} ext { C) } \pi R^{2} L \rholeft(\sqrt{\frac{\sigma}{ \rho}}-1 ight) & ext { D) } \pi R^{2} L \rholeft(\sqrt{\frac{\sigma}{2 \rho}}-1 ight)end{array}

Topic:

Mechanics

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1. A 20 gram bullet moving at

300 m / s

stops after penetrating

3 cm

of bone. Calculate the average force exerted by the bullet. [Ans.

- 3 \times 1 0^{4} N

Topic:

Mechanics

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Views: 5,373

A 20 gram bullet moving at

300 m / s

stops after penetrating

3 cm

of bone. Calculate the average force exerted by the bullet.

Topic:

Mechanics

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Views: 5,309

6. A block of metal weighing

2 kg

is resting on a frictionless plane. It is struck by a jet of releasing water at the rate of

1 kg s^{- 1}

, and at a speed of

5 ms^{- 1}

. Calculate the initial acceleration of the block. [Ans.

2.5 m / s^{2}

Topic:

Mechanics

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Views: 5,287

In Ifgure there are two concentric coils in parpernyieg planes carrying equal currents. Magnetic ficis centre is B. If curfent in one coil becomes zero it contre is B. If current in one coil becomes

$\frac{B}{2}$
$\frac{B}{3}$
$\frac{B}{2}$
$B 2$

Topic:

Electrostats

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b) Write short notes on: (any two) i) Buffer solution ii) Quantum number iii) Electrochemical series

Topic:

Atomic Structure

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Question 10

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Write short notes on: (any two)

Assumption of electronic theory of valency
Electrochemical series
Aufbau principle
Prevention from corrosion
Radicals

Topic:

Atomic Structure

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Question 11

Views: 5,778

The beam shown is below figure is supported by a hinge at '

A

' and a roller at '

B

'. The reaction

R_{A}

of the hinged support '

A

' of the beam is

13.

$10.8 t$
$10.6 t$
$10.4 t$
$10.2 t$

Topic:

Mechanics

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Question 12

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The beam shown is below figure is supported by a hinge at '

A

' and a roller at '

B

'. The reaction

R_{A}

of the hinged support '

A

' of the beam is 12. At a given in

5 t - 2 t m

$1 km / hi$

Topic:

Atomic Structure

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Question 13

Views: 5,252

Magnetic field at point 'P' due tren ren current distribution -

Topic:

Physics

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Question 14

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A White Heron by Sarah Orne Jewett (excerpt) In the excerpt from this short story, a hunter comes to the house of Sylvia and her grandmother. He is searching for a white heron. Sylvia knows where the white heron lives, but she is not sure she wants the hunter to find the bird. She is soon faced with a dilemma. (1) "So Sylvy knows all about birds, does she?" he exclaimed, as he looked round at the little girl who sat, very demure but increasingly sleepy, in the moonlight. "I am making a collection of birds myself. I have been at it ever since I was a boy." (Mrs. Tilley smiled.) There are two or three very rare ones I have been hunting for these five years. (2) "Do you cage 'em up?" asked Mrs. Tilley doubtfully, in response to this enthusiastic announcement. (3) "Oh no, they're stuffed and preserved, dozens and dozens of them," said the ornithologist, "and I have shot or snared everv one muself. I cauaht a alimbse of a white heron a few miles from here on Saturdav. and I have followed it in this 1 Select the correct answer. How is the hunter a foil for Sytvia?

The hunter is cold and distant: Sylvia is warm and kind.
The hunter wants to kill the white heron; Sylvia wants it to live.
The hunter is rich; Sylvia and her mother are poor.
The hunter doesn' know much about the white heron: Sylvia knows a great deal.

Topic:

Human Activity and Climate

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Question 15

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Question 4 In compound

A

6.3 g

of hydrogen and

18.7 g

of carbon, while in compound

B

6.9 g

of hydrogen and

41.0 g

of carbon. Which answer most likely shows their formulas?

A : CH 3; BCH

A : CH 4

BCH

CH 6; BCH 3

CH

B CH 2

Topic:

Bonding and Chemical Reactions

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Question 16

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A 3.1.2 Qutr: Newton's Laws of Motion Question 2 of 10 How can Newton's third law describe the forces affecting a rocket as it descends to Earth's surface?

The rocket can move downward because the forces acting on it are unbalanced.
The rocket pushes through the air with a force equal to that of Earth's gravity pulling on the rocket.
The force the rocket exerts on the air is in the direction opposite to the force that the air exerts on the rocket.
The maximum amount of force the rocket engines can provide determines how much mass the rocket can lift.

Topic:

Force and Motion

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Question 17

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What is the term for the circular movement of material inside Earth's mantle?

convection
equilibrium
conservation
density

Topic:

Matter and Energy

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Question 18

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COMPETENT ACCOMPLISHED Is your element stable? Explain using your Draw a Bohr model of your electrons.

Topic:

Nuclear Chemistry

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Question 19

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2. An interesting story is often told of baseball star Johnny Bench when he was a rookie catcher in 1968. During a Spring Training game, he kept signaling to star pitcher Jim Maloney to throw a curve ball. Maloney continuously shook off Bench's signal, opting to throw fastballs instead. The rookie catcher walked to the mound and told the veteran Maloney that his fastball wasn't fast enough and that he should throw some curve balls. Bench again signaled for a curve. Maloney shook of the signal and threw a fastball. Before the ball reached the plate, Bench took off his glove; he then caught the pitch barehanded.

a. Determine the impulse required to stop a 0.145-kg baseball moving at $35.7 m / s (80.0 mi / hr)$ .
b. If this impulse is delivered to the bail in $0.020$ seconds, then what is the magnitude of the force acting between the bare harid and the ball?
c. Explain how the glave could have decreased the force his hand experiences from the fastball.
3. NASA's Langley Research Center has been experimenting with the use of air bags to soften the landings of crew exploration vehicles (CEV) on land. What stopping time will be required in order to safely stop a $7250 kg$ CEV moving at $7.65 m / s$ with an average force of $426000 N$ (an average force of $6 s$ )?

Topic:

Energy

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Question 20

Views: 5,086

Direction: Use your notes as a guide and identify the statement either Photosynthesis or cellular respiration. 15. What is the name of the green organelle? 16. What is the name for the orange organelle?

Topic:

Human Activity and Climate

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