need help asap.......................

Answer:

C

Explanation:

You stand on the bathroom scale and then decide to jump off and observe the

change in the reading.

Answer:

a) F=ma

F=13.2×10

F=132

b) I=P/V

I=75/15

I=5

Answer:(B)

Explanation:

No; the inertial mass of Earth is so large that the planet’s change in motion is imperceptible, therefore the correct answer is option A.

According to Newton's first law, until pushed to alter its condition by the intervention of an external force, every object will continue to be at rest or in uniform motion along a single direction.

As given in the problem suppose the entire population of the world gathers in one spot and, at the sound of a prearranged signal, everyone jumps up. While all the people are in the air, we have to find out if Earth gains momentum in the opposite direction,

The mass of the earth is very huge approximately 5.97 ×10²⁴ kilogram.

Even the combined mass of all the population combined would be negligible as compared to the mass of the earth.

Thus, the earth would not gain momentum in the opposite direction.

Learn more about Newton's First Law here;

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Explanation:

Remember Newton's Second law

[tex]F = ma[/tex]

We can use this to solve for the force exerted by the tree on the car when it stops the car.

We aren't given the acceleration directly in the problem statement, but we can solve for acceleration.

Recall that acceleration is the change is velocity per unit time. [tex]a = \frac{\Delta v}{\Delta t}[/tex]

We know the original velocity as 21.1 m/s and the final velocity as 0.0 m/s. The time that it takes to stop the car is 0.22 seconds.

Now we can solve using the equation. [tex]F = \frac{21.1 - 0.0}{0.22} * 365[/tex]

Answer:

a)[tex]t=59.817652833125294s \approx 59.8s[/tex]

b)[tex]D_1=894.01m[/tex]

Explanation:

From the question we are told that

Speed of opposing player [tex]V_2=4.0m/s[/tex]

First player chase his opponent after[tex]t=2.80t[/tex]

Acceleration of  first player [tex]a=0.14 m/s2[/tex]

Let time of catch be  [tex]t_c[/tex]

a)Generally the Equation for distance covered is mathematically given as follows

Distance to catch First opponent

[tex]D_1=\frac{1}{2}(0.14)t^2[/tex]

[tex]D_1=0.07t^2[/tex]

Distance to covered Second opponent

[tex]D_2=(2.8+t)*4[/tex]

Generally when first opponent catch the second opponent it is represented mathematically as

[tex]D_2=D_1[/tex]

[tex]0.07t^2=(2.8+t)*4[/tex]

[tex]0.07t^2=11.2+4t[/tex]

[tex]0.07t^2-4t-11.2[/tex]

[tex]t=59.817652833125294s \approx 59.8s[/tex]

b)Generally the the total time traveled by the first opponent is mathematically given as

[tex]D_1=\frac{t^2}{4}[/tex]

[tex]D_1=\frac{59.8^2}{4}[/tex]

[tex]D_1=894.01m[/tex]

Answer:

So, I tested it out and came to a conclusion.

The rubber ball is quite bouncy due to the fact that it is made of rubber which is what makes it bounce back and high, but although the golfball does in fact bounce back it does not bounce as high as the rubber ball due to the fact that it is made of plastic.

Explanation:

Hope this helps you out!

When it comes to phase shifts or phase change the greater the intermolecular interactions are the closer the molecules are to one another.

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Answer:

Power = 2.5 [W]

Explanation:

To be able to solve this problem we must remember that power is defined as the relationship of the work done in a given time interval.

[tex]P=W/t[/tex]

where:

P = power [W] (units of watts)

W = work = 50 [J]

t = time = 20 [s]

Now replacing:

[tex]P=50/20\\P=2.5[W][/tex]

Answer:

2.5

Explanation:

Answer:

[tex]F=3.665 \times 10^{-7} N[/tex] acting along the line joining both the sphere and always attractive in nature.

Explanation:

The given radius of both the sphere, r= 65 mm = 0.065 m

So, the volume of the spheres, [tex]v= \frac 4 3 \pi r^3[/tex]

[tex]v= \frac 4 3 \pi (0.065)^3 = 1.150 \times 10^{-3} m^3[/tex]

The density of steel, [tex]\rho _s = 7850 kg/m^3[/tex]

and the density of copper, [tex]\rho_c= 8940 kg/m^3[/tex]

Let M be the mass of the copper ball and m  is the mass of the steel ball.

So, [tex]M=\rho_c v= 8940\times 1.150 \times 10^{-3} = 10.281[/tex] kg

[tex]m=\rho_s v= 7850\times 1.150 \times 10^{-3} = 9.0275[/tex] kg

The gravitational force, F, between the two objects having masses M and m and separated by distance d is

[tex]F=\frac{GMm}{d^2}[/tex]

Where [tex]G= 6.674 30 x 10^{-11} m^3 kg^{-1} s^{-2}[/tex] is the universal gravitational constant.

When both the sphere touches each other, d = 2r= 2 x 0.065 = 0.13 m

Hence, the gravitational force between both the sphere,

[tex]F= \frac {6.674 30 x 10^{-11}\times 10.281 \times 9.0275}{0.13^2} \\\\F=3.665 \times 10^{-7} N[/tex]

The nature of gravitational force is always attractive and acting along the line joining the center of both the sphere.

Answer:

B

Explanation:

The ray diagram demonstrated the phenomenon of absorption in B. Hence, option B is correct.

Absorption is the phenomenon of electromagnetic radiation taking up the energy of photons and it also transfers the electromagnetic energy to the internal energy of the absorber.  

Absorption refers to the transfer of the energy of a wave to matter as the wave passes through it. The process in which the light waves get converted into energy. Absorption causes attenuation of the waves and the intensity decreases gradually when the light waves propagate through the medium.

From the given, the first diagram represents the light passes through the slit, it gets diffracted and forms alternate bright and dark fringes in the screen. The third diagram represents that the light ray strikes the surface it gets reflected and the path of light gets changed.

Thus, the absorption is the ray diagram given in the second image. Hence, option B is correct.

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Answer:

v = 108 m/s.

Explanation:

Given that,

The position of a particle moving on a straight line is given by :

[tex]X =12 + 18t + 9t^2[/tex]

We need to find the instantaneous velocity at  t=5s.

Velocity, [tex]v=\dfrac{dX}{dt}[/tex]

So,

[tex]v=\dfrac{d(12 + 18t + 9t^2)}{dt}\\\\=18+18t[/tex]

Instantaneous velocity at t = 5 s will be :

v = 18+18t

v = 18+18(5)

= 18 + 90

= 108 m/s

So, the instantaneous veloctiy at  t=5s is 108 m/s.

Answer:

The increase in the internal energy is  1.840 x 10⁶ J.

Explanation:

Given;

mass of the water, m = 1000 g = 1 kg

temperature of the boiling water, t = 212 ° F  = 100 ° C

latent heat of vaporization, L = 2.260 MJ/kg = 2.260 x 10⁶ J/kg

The internal energy of the boiling water is calculated as;

Q₁ = mcΔθ

where;

c is specific heat capacity of water, = 4200 J/kg.⁰C

Δθ is change in temperature = 100 ° C

Q₁ = 1 x 4200 x 100

Q₁ = 420,000 J

The internal energy of the vaporized steam is calculated as;

Q₂ = mL

Q₂ = 1 x 2.260 x 10⁶

Q₂ = 2,260,000 J

The increase in the internal energy is calculated as;

ΔQ = Q₂ - Q₁

ΔQ = 2,260,000 J - 420,000 J

ΔQ = 1,840,000 J

ΔQ = 1.840 x 10⁶ J

Therefore, the increase in the internal energy is  1.840 x 10⁶ J.

Answer:

The silicon used to make monocrystalline solar cells has a high level of purity. ... Because of the way light interacts with a monocrystalline silicon layer, monocrystalline solar panels appear black in color.

Answer:

1.52m/s

Explanation:

Using the law of conservation of momentum

m1u1 + m2u2 = (m1+m2)v

m1 and m2 are the masses

u1 and u2 are the initial velocities

v is the final velocity

Substitute the given values into the formula

0.013(270)+2(130) = (270+130)v

3.51+260 = 400v

263.51 = 400v

v = 400/263.51

v = 1.52m/s

Hence the velocity after the bullet emerges is 1.52m/s

Answer:

See the explanation below.

Explanation:

Density will remain the same since density is the relationship between mass and volume. As we can see in the equation below.

[tex]Ro=m/V[/tex]

where:

Ro = density = 2.5 [g/cm³]

m = mass [g]

V = volume [cm³]

In such a way that when the glass is broken the small fragments retain the same density ratio. That is, each fragment has a small mass and a small volume. That's why the density remains the same.

Answer:

(a) The energy delivered by the pulse is 0.36 J

(b) the total charge that flows is 0.8 mC

Explanation:

Given;

potential difference of the electric eel, V = 450 V

current flow, I = 0.8 A

time of current flow, t = 1.0 ms = 1.0 x 10⁻³ s

(a) The energy delivered by the pulse is calculated as;

E = Pt

where;

t is time

P is power developed = IV

E = (IV)t

E = IVt

where;

I is the current

V is the potential difference

E = 0.8 x 450 x 1.0 x 10⁻³

E = 0.36 J

(b) the total charge that flows is calculated as;

Q = It

where;

I is the current

t is the time

Q = 0.8 x 1.0 x 10⁻³

Q = 0.0008  C

Q =  0.8 mC.

Answer:

2.72*10-3 Joules

Explanation:

From Newton's second law of motion

F=ma

[tex]\tau=I*\alpha[/tex]

given

[tex]\tau= 0.11Nm\\\\I=0.034kgm^2\\\\t= 8s\\\\\alpha=?[/tex]

[tex]\alpha =0.11/0.034\\\\\alpha=3.23 rad/s^2[/tex]

the angular velocity is

[tex]\omega = \alpha/t\\\\\omega =3.23/8\\\\\omega =0.4 rad/s[/tex]

[tex]KE= 1/2*I* \omega^2[/tex]

[tex]KE=1/2*0.034*0.4^2\\\\KE=1/2*0.034*0.16\\\\KE=0.00272\\\\KE=2.72*10^-3J[/tex]

A freely falling mass m will be pulled down toward the ground with downward acceleration +g while feeling upward drag D due to air resistance with acceleration -a such that D = - m a = - k v ². Hence the body's velocity v(t) changes with respect to time t according to the differential equation,

dv(t)/dt = m g - k v ²

Answer:

b

Explanation:

Answer:

8 m/s

Explanation:

KE Formula: KE = 1/2mv^2

Kinetic Energy is equal to energy, J.

6400 = 1/2 * 200 * V^2

1/2 * 200 = 100

6400 = 100 * V^2

6400/100 =  V^2

64 = V^2

Square root both sides

Speed is  8 m/s

Answer:

i didnt skip because you said not to ion even know the answer tho

Explanation:

Answer:

Na connect with chlorine because sodium is a cation that is in the alkali metal group. Sodium has a +1 charge and all it needs to do is lose a electron to become stable. This is is since Na only has one valence electron and to create a bond, it has no choice but to lose a electron.  In the alkali metal group, they are the groups that are the most reactive metals. On the other hand, chlorine is a anion that is in the halogens group. So chlorine has a -1 charge and all it needs to do is gain a electron to become stable. This is since chlorine has 7 valance electrons and needs 1 more electron to have a full outer shell.  In the halogens group, they are the groups that are the most reactive nonmetals. When sodium and chlorine create a chemical bond, they create a charge of 0 which is neutral. That's why they would connect to create a substance that is part of everything we eat.

1(-1 )+ 1(1) = 0.

Explanation:

Hope it helped!

Answer:

7 m/s approx

Explanation:

Step one:

Given data

Mass m= 42kg

distance covered= 100m

time taken = 14.2 seconds

Required

The speed of the athlete

Step two:

We know that speed= distance/time

Substitute

Speed= 100/14.2

Speed= 7.04 m/s

Speed= 7 m/s approx

Answer: wqcjn qefveqeqfbj qeib

Explanation:oiaer vgneiofrvn eiforbnewtjbioe

Answer:

The force exerted by each string is 25 N

Explanation:

Net Force

The net force is the vector sum of forces acting on a body. The net force is a single force that represents the effect of the original forces on the body's motion. It gives the particle the same acceleration as all those actual forces together as described by Newton's second law of motion.

The picture described in the problem is hanging at rest supported by two vertical strings. This means that the net force acting on it is zero.

Assume the magnitude of each of these equal forces is F, and the picture has a weight of W=50 N, thus the net force is:

F + F - W

The positive signs indicate an upwards direction and the negative sign means a downwards direction. Since the net force is zero:

F + F - W = 0

2F = W

F = W/2 = 50 N/2

F = 25 N

The force exerted by each string is 25 N

Answer: the man can power 2 incandescent light bulbs

Explanation:

Given that;

power produced by the body while riding = 500 W

Efficiency of generator = 40% = 0.4

First we need to convert the mechanical energy to electric energy;

which efficiency of generator multiply by power input, so

⇒ 0.4 × 500 = 200 W

Now, if 1 incandescent light bulbs is 100 W

x incandescent light bulbs bulbs is 200 W

100x W= 200 W

x = 200 W / 100 W

x = 2

Therefore, the man can power 2 incandescent light bulbs

Answer:

Power

Explanation:

Power, by definition, is the rate of doing work (aka, work with respect to time).