Help me and get points..


When a basketball player jumps to make a shot, once his or her feet are off the ground, the jumper's acceleration


A) Depends on the time in the air.


B) Depends on launch speed.


C) Is usually greater for taller players (but not always).


D) All the above are true


E) Is 10 m/s/s

Answer:

B. positive; negative.

Explanation:

From the viewpoint of Principle of Energy Conservation and Work-Energy Theorem, we notice that gravity represents a conservative force, associated with gravitational potential energy, whereas air resistance is a non-conservative force, associated with dissipated work. Therefore, the work done by gravity is positive and work done by air resistance is negative. Therefore, the correct answer is B.

A color.......................................................................yeah the color of your socks is a color :}

Answer:

[tex]V_2_X=33.16m/s[/tex]

Explanation:

From the question we are told that

Mass of car        [tex]M_1=1210kg \\Angle1=\theta _1 45\textdegree NE[/tex]

Velocity of car   [tex]v_1= 15m/s[/tex]

Mass of Truck  [tex]M_2= 1540kg \\Angle 2=\theta_2 0\textdegree E[/tex]

Final velocity    [tex]v_2= 23.3m/s[/tex]

Generally the the equation of the law of conservation of momentum is mathematically given by

Given the x direction

  [tex]m_1v_1cos\theta+m_2v_2=(m_1+m_2)v[/tex]

  [tex]1210*15.2cos45+1540*V_2=(1210+1540)*23.3[/tex]

  [tex]V_2=\frac{(1210+1540)*23.3}{210*15.2cos45+1540}[/tex]

  [tex]V_2=33.16m/s[/tex]

The x-component  of the second car's initial velocity is

[tex]V_2_X=33.16m/s[/tex]

Answer:

the apparent power of the circuit is 969.5 VA.

Explanation:

Given;

Applied voltage, E = 277 V

current flowing in the circuit, I = 3.5 A

Apparent occurs when the applied voltage and current are out of phase because of reactance. This apparent power of the circuit is calculated as;

[tex]P = EI\\\\P= 277 \ \times \ 3.5 \\\\P = 969.5 \ VA[/tex]

Therefore, the apparent power of the circuit is 969.5 VA.

Answer:

The man is on the verge of having a heart attack or a stroke.

Explanation:

If he has a family history of coronary (heart) disease, it means it could normally affect. Normally here means without anything aggravating it. It's already in his lineage so he could have it.

Now, he's past middle age - he's 45. He's past the growing stages of life. His organs are fully developed herefore.

Now also, he suffers from Type 2 diabetes. Although this is sometimes milder than Type 1 diabetes, it increases the risk of having a heart disease or a stroke!

Soda, especially sweetened one, is not to be taken too often because it can cause Diabetes Mellitus. For a diabetes patient, this should be a "no-go-area". Taking this constantly (everyday at work) will now put this 45-year-old man in harm's way.

He is no more at risk of having complications but already on the path to a heart disease or a stroke.

This question is incomplete, the complete question is;

The picture shows a triangular prism. The end of prism are equilateral triangles with x meters. the other dimension of the prism is L meters

a) Find the volume V in terms of x and L

b) Water is entering the prism at a rate of A m³/hr. The prism is empty at time 0. Express the depth d of the water in meters in terms of A, the length of time t the water has been entering the trough, and the length L of the prism.  

Answer:

a) the volume V in terms of x and L is  ((√3/4)x²L) m³

b) required expression is (2/(3)^(1/u))√(At/L)

Explanation:

Given that;

form the question and image below;

triangular prism ends are equilateral triangle

side length = x meter

Dimension of the prism = L meter

Area of the equilateral triangle = √3/4 (side)² = √3/4 (x)² meter

Volume of the triangular prism = Area × height

= √3/4 (x)² × L

V = ((√3/4)x²L) m³

Therefore, the volume V in terms of x and L is  ((√3/4)x²L) m³

b)

Rate of water entering = A m³/hr

Depth of water tank = d meter

Time = t

Length of prism = L

now Rate of water entering is A m³/hr

dv/d = A                             [  V = ((√3/4)x²L) m³ ]

and

dv/dt = √3/4 [2x dx/dt ] L                   { L is constant }

so

A = √3/4 [2x dx/dt ] L  

∫A dt = √3/2 [ Lx dx ]                   { Integrate both sides}

At = √3/2 × Lx × x²/2

x² = uAt / √3L                              { we find square root of both sides}

x = √( uAt / √3L )

x = (2/(3)^(1/u))√(At/L)

Therefore; required expression is (2/(3)^(1/u))√(At/L)

Answer:

Answer is explained in the explanation section below.

Explanation:

Solution:

We know from the Coulomb's Law that, Coulomb's force is directly proportional to the product of two charges q1 and q2 and inversely proportional to the square of the radius between them.

So,

F = [tex]\frac{Kq1q2}{r^{2} }[/tex]

Now, we are asked to get the greatest force. So, in order to do that, product of the charges must be greatest because the force and product of charges are directly proportional.

Let's suppose, q1 = q

So,

if q1 = q

then

q2 = Q-q

Product of Charges = q1 x q2

Now, it is:

Product of Charges = q x (Q-q)

So,

Product of Charges = qQ - [tex]q^{2}[/tex]

And the expression qQ - [tex]q^{2}[/tex] is clearly a quadratic expression. And clearly its roots are 0 and Q.

So, the highest value of the quadratic equation will be surely at mid-point between the two roots 0 and Q.

So, the midpoint is:

q = [tex]\frac{Q + 0}{2}[/tex]

q = Q/2 and it is the highest value of each charge in order to get the greatest force.

The question is incomplete. Here is the complete question.

An inductor, battery, resistance and ammeter and switch are connected in series. If the switch, initially open, is now closed, what is the current's final value?

a. zero

b. Battery voltage divided by inductance

c. battery voltage times inductance

d. battery voltage divided by resistance

Answer: d. battery voltage divided by resistance

Explanation: Resistance, voltage and current are related by Ohm's Law, which is explained as the current that passes through a conductor is directly proportional to the applied voltage. The constant of proportionality between them is Resistance.

Ohm's Law is represented by [tex]V=R.I[/tex]

Inductor is a component that stores magnetic energy when electricity is applied to it.

Ammeter is an object constructed to measure electric current of a circuit and it is always connected in serie.

So, in the circuit, when the switch is closed, the "only way" for current to pass through is because of Ohm's Law, which means its magnitude will be:

[tex]I=\frac{V}{R}[/tex]

Then, the correct alternative is d. voltage divided by resistance.

Answer:

[tex]v=2.4*10^8m/s[/tex]

Explanation:

From the question we are told that

Wavelength of emission [tex]\lambda=122nm[/tex]

Observation distance [tex]d=366nm[/tex]

Generally the s equation is given as

[tex]f'=f\sqrt{\frac{(1-\frac{v}{c} )}{1+\frac{v}{c} }[/tex]

where

F is inversely proportional to T

[tex]d=\lambda\sqrt{\frac{(1-\frac{v}{c} )}{1+\frac{v}{c} }[/tex]

[tex]\frac{v}{c} =\frac{(1-\frac{\lambda}{d})}{(1+\frac{\lambda}{d}}[/tex]

[tex]\frac{v}{c}=\frac{1-(\frac{122}{366} )^2}{1+(\frac{122}{366})^2}[/tex]

[tex]\frac{v}{c}=\frac{0.8888888889}{1.11111111}[/tex]

[tex]\frac{v}{c}=0.80[/tex]

[tex]v=0.80*3*10^6[/tex]

[tex]v=2.4*10^8m/s[/tex]

Answer:

C. Methane

Explanation:

A chemical equation can be defined as a reaction between two chemical elements.

For a chemical reaction (equation) to be balanced, the condition which must be met is that the number of atoms contained in the reactants must be equal to the number of atoms in the products.

This ultimately implies that, the mass and charge of the chemical equation are both balanced properly.

Methane is a hydrocarbon compound formed by the reaction between four (4) hydrogen atoms with a carbon atom. It belongs to the alkane group of hydrocarbons and has the following physical and chemical properties; colorless, highly flammable, non-toxic and odorless gas. The empirical formula for Methane is CH4.

Methane is a gas at 45 degrees celsius. This ultimately implies that, at 45°C methane is a gas because it is still within the range of standard temperature and pressure.

Given :

Weight of car is, W = 10000 N.

Acceleration due to gravity, g = 10 N/kg.

To Find :

The mass of car on Earth.

Solution :

We know, mass of an object is given by :

[tex]m = \dfrac{W}{g}\\\\m = \dfrac{10000}{10}\ kg\\\\m = 1000\ kg[/tex]

Therefore, mass of the car on Earth is 1000 kg.

Answer:

For the detection of beta particles, organic scintillators can be used. Pure organic crystals include crystals of anthracene, stilbene, and naphthalene. The decay time of this type of phosphor is approximately 10 nanoseconds. This type of crystal is frequently used in the detection of beta particles.

- Hope this helps!

Answer:

I. 6 cells .

II. Series connection.

Explanation:

I. Determination of the number of cells needed.

From the question given above,

Total voltage (V) = 9 V

1.5 V = 1 cell

Number of cells needed =?

The number of cells needed to make the 9V battery can be obtained as follow:

1.5 V = 1 cell

Therefore,

9 V = 9 V × 1 cell / 1.5 V

9 V = 6 cells

Thus, 6 cells of 1.5 V each is needed

II. Determination of the connection line

Total voltage (Vₜ) = 9 V

Cell 1 (V₁) = 1.5 V

Cell 2 (V₂) = 1.5 V

Cell 3 (V₃) = 1.5 V

Cell 4 (V₄) = 1.5 V

Cell 5 (V₅) = 1.5 V

Cell 6(V₆ ) = 1.5 V

For parrall connection:

Vₜ = V₁ = V₂ = V₃ = V₄ = V₅ = V₆

9 V = 1.5 V =... = 1.5 V

For series connection:

Vₜ = V₁ + V₂ + V₃ + V₄ + V₅ + V₆

9 = 1.5 + 1.5 + 1.5 + 1.5 + 1.5 + 1.5

9 V = 9 V

From the illustration above, we can see that series connection of each cells will give a total volt of 9 V unlike the parallel connection which resulted to 1.5 V.

Therfore, the cells should be arranged in series connection

Answer:

W = 29.06 KJ

Explanation:

The work done while stretching the leash can be calculated by the following formula:

[tex]W = \int\limits^b_a {F_{x}} \, dx \\[/tex]

whee,

W = Work Done = ?

Fₓ = Forcing Function = (-5.7 N/m)x - (78 N/m²)x²

a = starting point of x = 0 m

b = end point of x = 22 m

Therefore,

[tex]W = \int\limits^{22\ m}_{0\ m} {(-(5.7\ N/m)x - (7.8\ N/m^{2})x^{2}}) \, dx \\Integrating\ we\ get:\\W = -\frac{(5.7\ N/m)x^{2}}{2} - \frac{(7.8\ N/m^{2})x^{3}}{3}\\Applying\ limits:\\W = -\frac{(5.7\ N/m)(22\ m)^{2}}{2} - \frac{(7.8\ N/m^{2})(22\ m)^{3}}{3} - 0\\W = - 1379.4\ J - 27684.8\ J\\W = 29064.2\ J[/tex]

W = 29.06 KJ

a. All go out

b. All get dimmer

c. All get brighter

d. All stay on

professional is the answer

3rd

Answer:

T = 1733.16 s = 28.88 min

Explanation:

The orbital velocity of a satellite about Earth is given as follows:

[tex]v = \sqrt{\frac{GM}{R}}[/tex]

where,

v = orbital speed = ?

G = Gravitational Constant = 6.67 x 10⁻¹¹ Nm²/kg²

M = Mass of Earth = 5.982 x 10²⁴ kg

R = Orbit Radius = 3.117 x 10⁶ m

Therefore,

[tex]v = \sqrt{\frac{(6.67\ x\ 10^{-11}\ Nm^{2}/kg^{2})(5.982\ x\ 10^{24}\ kg)}{(3.117\ x\ 10^{6}\ m)}}\\\\v = 11.3\ x\ 10^{3}\ m/s[/tex]

but the velocity is given as:

[tex]v = \frac{distance}{time}[/tex]

for distance = circumference = 2πR

time = time period = T = ?

Therefore,

[tex]11.3\ x\ 10^{3}\ m/s = \frac{2\pi(3.117\ x\ 10^{6}\ m)}{T}\\\\T = \frac{2\pi(3.117\ x\ 10^{6}\ m)}{11.3\ x\ 10^{3}\ m/s}\\\\[/tex]

T = 1733.16 s = 28.88 min

Answer:

25%

Explanation:

500 J out of 2000 J is 25%

Correct question is;

A ballet dancer spins with 2.4 rev/s with her arms outstretched,when the moment of inertia about axis of rotation is I. With her arms folded,the moment of inertia about the same axis becomes 0.6I about the same axis. Calculate the new rate of spin.

Answer:

4 rev/s

Explanation:

We are given;

Initial Angular velocity; ω_i = 2.4 rev/s

Initial moment of inertia; I_i = I

Final moment of inertia; I_f = 0.6I

From conservation of angular momentum, we have;

I_i × ω_i = I_f × ω_f

Where ω_f is the new rate of spin.

Thus, let's make it the subject to get;

ω_f = (I_i × ω_i/I_f)

Plugging in relevant values, we have;

ω_f = (I × 2.4/0.6I)

I will cancel out to give;

ω_f = 2.4/0.6

ω_f = 4 rev/s

Answer:7.58 m

Explanation:

The required wavelength of a sound wave of frequency 660 Hz in steel is approximately 7.58 meters.

Wavelength is a fundamental property of waves, including electromagnetic waves like light and radio waves, as well as other types of waves, such as sound waves or water waves.

Here,
The wavelength (λ) of a sound wave is given by the formula,

λ = v/f

where v is the speed of sound in the medium and f is the frequency of the wave.

In this case, the speed of sound in steel is v = 5000 m/s, and the frequency of the sound wave is f = 660 Hz. Substituting these values into the formula, we get:

λ = 5000 m/s / 660 Hz

λ = 7.58 meters (rounded to two decimal places)

Therefore, the wavelength of a sound wave of frequency 660 Hz in steel is approximately 7.58 meters.

Learn more about wavelength here:

https://brainly.com/question/17197275

#SPJ6

Answer:

Explanation:

given linear charge density λ = 290 x 10⁻³ C / m

Expression for electric field at distance d is given as follow .

E = λ / 2πε₀r

1 / 4πε₀ = 9 x 10⁹

1 / 2πε₀ = 18 x 10⁹

E = λ / 2πε₀r = 290 x 10⁻³ x 18 x 10⁹ / r

= 5220 x 10⁶ / r

For r = 10 x 10⁻² m = .1 m

E = 5220 x 10⁶ / .1

= 5.22 x 10¹⁰ N/m

For r = 100 x 10⁻² m = 1 m

E = 5220 x 10⁶ / 1

= 5.22 x 10⁹ N/m .

Answer:

know on car wright now

Explanation:

Answer:

4.61 * 10^-14 m/s ; 9.20 * 10^-10 m/s

Explanation:

To acceleration due to gravity, a

a = GM / r²

Mass of pluto = 1.4x10^22 kg

Distance apart, r = 4.50x10^12 m

G = Gravitational constant = 6.67 * 10^- 11

a = (6.67*10^-11 * 1.4x10^22) / (4.50x10^12)²

a = 9.338 * 10^(-11 + 22) / 20.25x10^24

a = 0.461 * 10^(11 - 24)

a = 0.461 * 10^-13

a = 4.61 * 10^-14 m/s

B.)

Mass of Uranus = 8.62x10^25 kg

Distance apart, r = 2.50x10^12 m

a = (6.67*10^-11 * 8.62x10^25 ) / (2.50x10^12 )²

a = 57.4954 * 10^(-11 + 25) / 6.25x10^24

a = 9.199264 * 10^(14 - 24)

a = 9.199264 * 10^-10

a = 9.20 * 10^-10 m/s

Answer:

Time, t = 0.439 seconds

Explanation:

Given the following data;

Angle, x = 21°

Initial velocity, u = usinx = 12Sin21° = 4.3004m/s

We know that acceleration due to gravity is equal to 9.8m/s

Final velocity = 0m/s since it reached its highest trajectory.

To find the time, we would use the first equation of motion;

V = U + gt

0 = 4.3004 + (-9.8)t

0 = 4.3004 - 9.8t

9.8t = 4.3004

t = 4.3004/9.8

t = 0.439 seconds

Therefore, it will take the ball 0.439 seconds to reach the top of its trajectory.

Answer: 0.44 s

Explanation:

that’s what I got correct on my test in physics ;)

Answer:

false

Explanation:

Answer:

The acceleration of the ball as it rises to the top of its arc equals 9.807 meters per square second.

Explanation:

Let suppose that maximum height of the arc is so small in comparison with the radius of the Earth.

Since the ball is launched upwards, then the ball experiments a free-fall motion, that is, an uniform accelerated motion in which the element is accelerated by gravity. Then, the acceleration experimented by the motion remains constant at every instant and position.

Besides, the gravitational acceleration in the Earth and, in consequence, the acceleration of the ball as it rises to the top of its arc equals 9.807 meters per square second.

Answer:

We need to add 9 N in the direction of F(1)

Explanation:

We know that in equilibrium the total force is equal to zero, so we have:

[tex]F_{total}=F_{1}+F_{2}+F_{3}=0[/tex]

F(1) is 12 N

F(2) is 21 N in the opposite direction

F(3) is the additional force.

Then, using these values into the total force equation we have:

[tex]12-21+F_{3}=0[/tex]

[tex]-9+F_{3}=0[/tex]

[tex]F_{3}=9\: N[/tex]

Therefore, we need to add 9 N in the direction of F(1)

I hope it helps you!

Answer:

b

Explanation:

i just did that question