The density of ice is 917 kg/m^3, and the density of sea water is 1025 kg/m^3. A swimming polar bear climbs onto a piece of floating ice that has a volume of 6.78 m^3. What is the weight of the heaviest bear that the ice can support without sinking completely beneath the water?

Answer:

c

Explanation:

Answer:

the magnitude of A is 3.577

Explanation:

According to the question it is given that there is a magnitude of 8.0 m that added to the vector A that lies on x axis also the sum of two vectors would be third vector by considering the y axis and the magnitude is the twice of the magnitude B

The computation of the magnitude of A is shown below:

[tex]A \hat{i} + B = 2A \hat{j}\\\\A \hat{i} + 8 = 2A \hat{j}\\\\8 = 2A \hat{j} - A \hat{i}\\\\\mid8\mid = \sqrt{(2A \hat{j})^2 + (- A \hat{i})^2} \\\\8 = \sqrt{5A} \\\\A = \frac{8}{\sqrt{5} }[/tex]

A = 3.577

Hence, the magnitude of A is 3.577

Answer:

Please find the answer in the explanation.

Explanation:

Balancing the forces acting on a body is not enough to establish equlibrium because of the principle of moment say that:

1.) For equilibrium to be attained, the sum of clockwise moment must be equal to the sum of anticlockwise moments.

2.) The sum of upward forces must be equal to the sum of the downward forces

According to the definition of moment, is the product of force and perpendicular distance.

Therefore, the perpendicular distance is needed to be considered.

Answer:

2.64N  

Explanation:

Force = mass * acceleration

Given

mass = 4kg

distance = 1.9m

Time t = 2.4s

Get the acceleration using the equation of motion

S = ut + 1/2at²

1.9 = 0 + 1/2a(2.4)²

1.9 = 5.76a/2

1.9 = 2.88a

a = 1.9/2.88

a = 0.66m/s²

Get the magnitude of the force

Force = 4 * 0.66

Force = 2.64N

Hence the net force acting on the fish is 2.64N  

Answer:

D ko alam pasensya ka na ha

Answer:

The speed the bat is gaining on its prey is 0.03m/s

Explanation:

Given;

speed of the bat, v₀ = 3.7 m/s

frequency of the bat, F₀ = 36 kHz

frequency of the source, Fs = 36.79

This is relative motion between a source of the sound and the observer.  The phenomenon is known as Doppler effect.

Apply the following equation to determine the speed of the insect which is the source;

[tex]F_0 = F_s[\frac{v+v_0}{v-v_s} ]\\\\\frac{F_0}{F_s} = [\frac{v+v_0}{v-v_s} ]\\\\\frac{36.79}{36} = \frac{340+3.7}{340-v_s}\\\\1.0219 = \frac{343.7}{340-v_s}\\\\ 340-v_s = \frac{343.7}{1.0219}\\\\340-v_s = 336.33\\\\v_s = 340-336.33\\\\v_s = 3.67 \ m/s[/tex]

The speed the bat is gaining on its prey = 3.7m/s - 3.67m/s = 0.03 m/s

Therefore, the speed the bat is gaining on its prey is 0.03m/s

Answer:

i think its A

Explanation:

Answer:

D

Explanation:

The chemical energy stored in food is released by cells through the process of respiration. (cellular respiration)

This stored energy is released whenever these chemical bonds are broken in metabolic processes such as cellular respiration. Cellular respiration is the process by which the chemical energy of “food” molecules is released and partially captured in the form of ATP.

Answer:

Explanation:

When two ball of identical mass collides perfectly elastically , there is exchange of velocity between the two balls .

Here ball be was at rest initially . After collision ball A comes to rest , so there is complete exchange of velocity . Hence ball A must have same mass as that of B . mass of ball A = 1 kg .

b ) Due to complete exchange of velocity , velocity of ball A will be picked up by ball B . Hence velocity of ball B = 3.1416 m /s . Yes it will be moving in the direction of ball A .

c )

In case of perfectly inelastic collision they will become  single mass

total mass = 2 kg

applying conservation of momentum law

their common velocity after collision = 1 x 3.1416 / 2 = 1.57 m /s

d )

Applying conservation of momentum law

initial momentum = Ma x va

they move in opposite direction after collision

their total momentum after collision

1 x va - Ma va

applying law of conservation of momentum

1 x va - Ma va  = Ma va

va = 2Ma va

Ma = .5 kg .

Answer:

c- chemical  to thermal

Explanation:

Answer:

It is called a mixture.

Explanation:

A mixture is a physical combination of 2 or more substances that are blended together without forming a new substance.

Answer:

Explanation:

The acceleration of an object given it's mass and the force acting on it can be found by using the formula

[tex]a = \frac{f}{m} \\ [/tex]

f is the force

m is the mass

From the question we have

[tex]a = \frac{11 \times {10}^{3} }{1200} \\ = 9.16666...[/tex]

We have the final answer as

Hope this helps you

Answer:

Highest order: m = 1

Explanation:

Formula for solving this is;

dsin θ_m = mλ

We want to find m, thus;

m = (dsin θ_m)/λ

We are told that White light spans from 380nm - 750 nm. Thus, at maximum, λ = 750 nm.

θ_m = 90°

d = (900 lines/mm) = 9000 × 10^(-7) lines/nm

Since we want to find m, the units nm has to cancel out in the equation.

Thus, we will write d in nm/lines as (10^(7))/9000 nm/lines

Thus;

m = ((10^(7))/9000 × sin 90)/750

m = 1.48

Approximately 1

Answer:

C

Explanation:

The uncertainty will carry the unit of time because it's the time in itself that has error, and not the distance, nor the velocity.

Had it been the uncertainty was to the velocity, then we would say both the unit of the distance and that of the time would have been affected. But as it stands, only that of time will be affected.

Answer:

d. 2063 Hz

Explanation:

Given that the source of the sound (the ambulance) is heading towards the observer, we have;

fL= (v ± vL/v ± vS) fS

Where;

v = speed of sound = 340 m/s

vL = velocity of the listener = 15 m/s

vS = velocity of the source = 25 m/s

fS = frequency of source = 2 kHz

Since the source is moving towards the observer we subtract;

Substituting values;

fL = (340 - 15/340 - 25)2 *10^3

fL = 2063Hz

The frequency of the siren heard by the driver is approximately 2254Hz.

Hence, Option C) 2254Hz is the correct answer.

Given the data in the question;

Frequency heard by observer; [tex]f' = \ ?[/tex]

To find the frequency heard by the observer, we Doppler Effect Equation:

[tex]f' = [ \frac{v+v_o}{v - v_s} ] f[/tex]

Where [tex]f'[/tex] is the observed frequency, [tex]f[/tex] is the actual frequency, [tex]v[/tex] is the velocity of sound, [tex]v_o[/tex] is the velocity of the observer and [tex]v_s[/tex] is the velocity of the source.

We substitute our given values into the equation

[tex]f' = [ \frac{340m/s\ +\ 15m/s}{340m/s\ -\ 25m/s} ] 2000Hz\\\\f' = [ \frac{355m/s}{315m/s} ] 2000Hz\\\\f' = 2253.968Hz\\\\f' = 2254Hz[/tex]

The frequency of the siren heard by the driver is approximately 2254Hz.

Hence, Option C) 2254Hz is the correct answer.

Learn more: https://brainly.com/question/1330077

Answer:

[tex]I=2\ kgm^2[/tex]

Explanation:

Given that,

Mass of a person, m = 72 kg

Force acting on a doorknob, F = 5 N

The doorknob is located 0.800 m from axis of the frictionless hinges of the door.

The angular acceleration of the dor, a = 2 rad/s²

We need to find the moment of inertia of the door about the hinges.

The person applies a torque to the door and it is given by :

[tex]\tau=Fr[/tex] ...(1)

Also, the torque is equal to :

[tex]\tau=I\alpha[/tex] ...(2)

From equation (1) and (2) we get :

[tex]Fr=I\alpha[/tex]

I is the moment of inertia

[tex]I=\dfrac{Fr}{\alpha }\\\\I=\dfrac{5\times 0.8}{2}\\\\=2\ kgm^2[/tex]

So, the moment of inertia of the door about the hinges is [tex]2\ kgm^2[/tex].

At the equator, the earth spins a distance of 25,992 miles every day, which is equal to 1083 mph.

An equator is a hypothetical line that circles the center of a planet or other celestial body. It is located at 0 degrees latitude, midway between the north and south poles. The globe is divided into northern and southern hemispheres by an equator.

The diameter of the Earth is also larger at the Equator, resulting in a phenomenon known as an equatorial bulge. A circle's diameter is measured by a straight line that goes through its center and has its ends on the circle's edge. The diameter of latitudes such as the Equator and the Arctic Circle can be calculated by scientists.

At the equator, the earth spins a distance of 25,992 miles every day

This is equal to (25992 ÷ 24) miles per hour

= 1083 mph.

Learn more about equator here:

https://brainly.com/question/24203207

#SPJ2

Answer:A: mountain formation

Explanation:

Answer:

Explanation:

The acceleration of an object given it's mass and the force acting on it can be found by using the formula

[tex]m = \frac{f}{a} \\ [/tex]

f is the force

a is the acceleration

From the question we have

[tex]m = \frac{42}{3.99} \\ = 10.5263...[/tex]

We have the final answer as

Hope this helps you

Answer:

8.42Joules

Explanation:

The rotational kinetic energy, denoted by E(rotational), can be calculated using the formula:

E(rotational) = 1/2 × I × ω²

Where;

I = moment of inertia (kgm²)

ω = angular velocity (rad/s)

However, we need to calculate the moment of inertia in this question by using the formula:

I = m × r²

Where;

m = mass (1.3kg)

r = radius (0.6m)

I = 1.3 × 0.6²

I = 1.3 × 0.36

I = 0.468 kgm²

Since I = 0.468 kgm², ω = 6 rad/s, we can calculate rational kinetic energy using:

K.E(rotational) = 1/2 × I × ω²

K.E(rotational) = 1/2 × 0.468 × 6²

K.E(rotational) =1/2 × 0.468 × 36

K.E(rotational) = 18 × 0.468

K.E(rotational) = 8.424

K.E(rotational) = 8.42Joules

Answer:

um hm err

Explanation:

Answer:

a

 [tex]W_s = 8[/tex]

b

[tex]P = 594 000 \ Pa[/tex]

Explanation:

Considering question a

 From the question we are told that

   The weight of the object in  air is  [tex]W_1 = 7.84 \ N[/tex]

    The weight of the object in water  is [tex]W_2 = 6.86\ N[/tex]

Generally the specific gravity of the object is mathematically represented as

       [tex]W_s = \frac{W_1 }{W_1 - W_2 }[/tex]

=>    [tex]W_s = \frac{7.84}{7.84 -6.86 }[/tex]

=>    [tex]W_s = 8[/tex]

Considering question b

From the question we are told that        

   The pressure required is  [tex]P_r = 300 \ kPa = 300 *10^{3} \ Pa[/tex]

    The height is  [tex]h = 30.0 \ m[/tex]

Generally the pressure require to get the water to  the given height is mathematically represented as

      [tex]P_h = \rho * g * h[/tex]

Here  [tex]\rho[/tex] is the density of  water with value  [tex]\rho = 1000 \ kg / m^3[/tex]

So  

     [tex]P_h = 1000 * 9.8 * 30[/tex]

=>  [tex]P_h = 294000 \ Pa[/tex]

Generally the pressure require to pump the water to  the given height at the require pressure is mathematically represented as

      [tex]P = P_h + P_r[/tex]

=>  [tex]P = 294000 + 300*10^{3}[/tex]

=>  [tex]P = 594 000 \ Pa[/tex]

Answer:

a. 600 nm

b. 300 nm

Explanation:

According to the question it is given that there is two flat glass surface that is separated by 150nm air gap

Based on the above information

The computation is shown below

a. The bright thickness is

[tex]t = \frac{\lambda}{2} (m - \frac{1}{2} )\\\\\lambda = \frac{2t}{(m - \frac{1}{2} )} \\\\\frac{2(150)}{(1 - \frac{1}{2} )} \\\\[/tex]

= 600 nm

b. The dark thickness is

[tex]t = \frac{m\lambda }{2} \\\\\lambda = \frac{2t}{m} \\\\\frac{2(150)}{1}[/tex]

= 300 nm

Answer:

a = 3.33 m/s²

Explanation:

The horizontal acceleration of the dog can be found by using Newton's Second Law of Motion as follows:

F = ma

where,

F = Unbalanced force applied on the dog = 11 N - 10 N = 1 N

m = mass of the dog = 0.3 kg

a = horizontal acceleration of dog = ?

Therefore,

1 N = 0.3 kg(a)

a = 1 N/0.3 kg

a = 3.33 m/s²

Answer:

65F

Explanation:

Answer:

B

Explanation:

Newton’s Second Law of Motion

Newton’s Second Law of Motion states that ‘when an object is acted on by an outside force, the mass of the object equals the strength of the force times the resulting acceleration’.

This can be demonstrated dropping a rock or and tissue at the same time from a ladder. They fall at an equal rate—their acceleration is constant due to the force of gravity acting on them.

The rock's impact will be a much greater force when it hits the ground, because of its greater mass. If you drop the two objects into a dish of water, you can see how different the force of impact for each object was, based on the splash made in the water by each one.

Answer:

b

Explanation:

Answer:

a high density i believe

Explanation:

Answer:

it may have a higher density

Complete Question

A commercial diffraction grating has 600 lines per mm.  

When a student shines a 540 nm laser through this grating, how many bright spots could be seen on a screen behind the grating?

Answer:

The number of  bright spots is  [tex]m = 7[/tex]    

Explanation:

From the question we are told that

  The wavelength is  [tex]\lambda = 540 nm = 540 *10^{-9} \ m[/tex]

   The number of lines per length the commercial diffraction grating has is [tex]L = 600 \ lines / mm = 600 * 1000 \ lines / m = 600 *10^{3} \ lines / m[/tex]

Generally the condition for constructive interference is mathematically represented as

       [tex]dsin(\theta) = n\lambda[/tex]

Here d  is the separation between the gratings which is mathematically represented as

       [tex]d=\frac{1}{L}[/tex]

=>    [tex]d=\frac{1}{600 *10^{3}}[/tex]

=>    [tex]d= 1.67 *10^{-6 } \ m[/tex]

and  n is the order of bright fringe, the maximum number is seen when [tex]\theta = 90^o[/tex]

So

   [tex]1.67 *10^{-6}sin(90) = n * 540 *10^{-9 }[/tex]

=>  [tex]n = 3[/tex]

Generally the number of bright spot (considering central bright fringe and the same order of bright fringe on each side of the central  bright fringe) is mathematically represented as

      [tex]m = n * 2 + 1[/tex]

=>   [tex]m = 3 * 2 + 1[/tex]

=>   [tex]m = 7[/tex]    

Answer:

Explanation:

second one ??? pls i hope im right

Answer:

A bumper that crumbles (plato)

Explanation: