An object is moving east, and its velocity changes from 65 m/s to 25 m/s in 10 seconds. Which describes the acceleration? negative acceleration of 4 m/s2 positive acceleration of 4 m/s2 positive acceleration of 9 m/s2 negative acceleration of 9 m/s2

Given that,

Angle = 30°

Initial velocity = 15 m/s

We need to calculate the time of flight

Using formula of time of flight

[tex]T=\dfrac{2u\sin\theta}{g}[/tex]

Where, u = initial velocity

g = acceleration due to gravity

Put the value into the formula

[tex]T=\dfrac{2\times15\sin30}{9.8}[/tex]

[tex]T=1.5\ sec[/tex]

We need to calculate the final velocity of the ball

Using equation of motion

[tex]v=u+gt[/tex]

[tex]v=15+9.8\times1.5[/tex]

[tex]v=29.7\ m/s[/tex]

Hence, The final velocity of the ball is 29.7 m/s.

Answer:

λ = 6,108 10⁻⁷ m = 610.8 nm

λ = 5.513 10⁻⁷ m = 551.3 nm

Explanation:

Young's double slit experiment results in a pattern consisting of maxima and minima of interference, the maximums are described by the expression

          d sin θ = m λ

where d of the distance between the two slits, θ is the angle from the central maximum to the given interference line, λ the wavelength of the radiation and an integer indicating the order of interference

In this exercise they give us several conditions

The first

the angle is 1.12º to the maximum m = 8

the distance between the slits d = 0.000250 m

of the initial equation

           λ = d sin θ / m

           λ = 0.000250 sin 1.12 / 8

           λ = 6,108 10⁻⁷ m = 610.8 nm

The second

the distance from the slits to the screen is L = 302.0 cm = 3.020 m

the distance from the central maximum is y = 3.33 cm = 0.0333 m for interference m = 5

in this case we use that the angle in the experiment is small

      tan θ = y / L

      tan θ = sin θ / cos θ = sin θ

we substitute

       sin θ = y / L

       d y / L = m λ

       λ = d y / L m

we calculate

       λ = 0.000250 0.0333 / (3,020 5)

       λ = 5.513 10⁻⁷ m = 551.3 nm

Explanation:

[tex]power = \frac{energy \: expended}{time} [/tex]

m = 7.3kg

u = 0

v = 14m/s

t = 1.5sec

P = (0.5×7.3×14²) ÷ 1.5

P = 476.93

P = 477 watt

The power is 744 watts

The first step is to write out the parameters

mass= 7.3kg

v= 14

u= 0

time= 1.5 secs

power= energy/time

= 0.5×7.3×14²/1.5

= 0.5×7.3×196÷ 1.5

= 715.4÷ 1.5

= 477

Hence the power that was developed is 477 watts

Please see the link below for more information

https://brainly.com/question/17031649?referrer=searchResults

Answer:

a. It would shrink

b. It would expand

Explanation:

a. Since the water bottle is filled with air at atmospheric pressure at 20000 ft, and since atmospheric pressure decreases with altitude, when we go up in elevation.

The pressure exerted by the molecules of air in the water bottle seek to balance out the atmospheric pressure as we go higher. Since the atmospheric pressure exerted by the molecules of air in the atmosphere are greater than that exerted by the molecules of air in the water bottle, this causes the volume of the water bottle to decrease and thus shrinks the water bottle until the pressure balances out

b. Since the water bottle is filled with air at atmospheric pressure at 20000 ft, and since atmospheric pressure increases with decreasing altitude, when we go down in elevation.

The pressure exerted by the molecules of air in the water bottle seek to balance out the atmospheric pressure as we go lower. The water bottle expands until the atmospheric pressure outside equals the pressure inside the water bottle.this causes the volume of the water bottle to increase and thus expands the water bottle until the pressure balances out

Answer:

it just pulls them at the same time

Explanation:

Answer:

Given that

speed u=4*10^6 m/s

electric field E=4*10^3 N/c

distance b/w the plates d=2 cm

basing on the concept of the electrostatices

now we find the acceleration b/w the plates  to find the horizontal distance traveled by the electron when it hits the plate.

acceleration a=qE/m=[tex]1.6*10^{-19}*4*10^3/9.1*10^{-31} =0.7*10^{15}[/tex]=[tex]7*10^{14}[/tex] m/s

now we find the horizontal distance traveled by electrons hit the plates

horizontal distance

[tex]X=u[2y/a]^{1/2}[/tex]

=[tex]4*10^6[2*2*10^{-2}/7*10^{14}]^{1/2}[/tex]

=[tex]3*10^{-2}[/tex]= 3 cm

Answer:

Speed of the satellite V = 6.991 × 10³ m/s

Explanation:

Given:

Force F = 3,000N

Mass of  satellite m = 500 kg

Mass of earth M = 5.97 × 10²⁴

Gravitational force G = 6.67 × 10⁻¹¹

Find:

Speed of the satellite.

Computation:

Radius r = √[GMm / F]

Radius r = √[(6.67 × 10⁻¹¹ )(5.97 × 10²⁴)(500) / (3,000)

Radius r = 8.146 × 10⁶ m

Speed of the satellite V = √rF / m

Speed of the satellite V = √(8.146 × 10⁶)(3,000) / 500

Speed of the satellite V = 6.991 × 10³ m/s

Answer:

858375 N of force is exerted on the pile driver by the beam.

Explanation:

mass of the pile driver m = 2100 kg

distance of fall = 5 m

distance through which the beam is driven = 12 cm = 0.12 m

weight of the pile driver = mg

where g = acceleration due to gravity = 9.81 m/s^2

weight of pile driver = 2100 x 9.81 = 20601 N

work done by gravity in bringing the pile driver done the 5 m height is

work = weight x distance = 20601 x 5 = 103005 J

This work by gravity is also used to do work in driving the beam into the 12 cm depth.

The force exerted by the beam on the pile driver will be proportional to the force used to do the work in driving the beam through the 12 cm depth.

equating the works, we have

103005 = F x 0.12

F = 103005/0.12 = 858375 N of force

Answer:

0.109  m/s

Explanation:

The calculation of the volume flow rate of the water is shown below:-

Av = Velocity ([tex]\pi[/tex])(Radius)^2

= 0.87([tex]\pi[/tex])(0.2)^2

= 0.135258 m^3 / sec

= 0.109371429 m/s

or

= 0.109

So, for calculating the volume flow rate of the water we simply applied the above formula i.e by multiplying the velocity with pi and squaring of radius so that the volume could come

Answer:

The average densities of both matches the expected density for objects made from water ice.

Explanation:

Charon's density is 1.2 to 1.3 g / cm3, while Pluto's density is 1.8 to 2.1 g / cm3. This was discovered in many researches and measurements of these two celestial bodies, with the objective of understanding them and promoting efficient scientific knowledge.

With the measurements of the average densities between pluto and Charon it was possible to conclude several statements about them. Firstly, it is possible to see that the two formed independently and at different times, in addition to indicating the existence of few rocks in charon, which is consistent with the average density of objects made mostly of water ice.

Answer:

Kg

Explanation:

Answer:

5.58 kg

Explanation:

The SI unit for mass is kg.  A Newton is defined as:

N = kg m/s²

So the answer would be 5.58 kg.

Answer:

1) current

2) energy

3) medium

4) matter

Explanation:

A wave is a medium that carries energy through space. Some waves travel through empty space. Other waves must travel through a material, also known as an energy. Waves transfer energy but not matter.

A wave is a phenomenon that flows across a material medium without leaving any lasting mark. Mechanical or electromagnetic waves can be used to classify it. Transverse and longitudinal are the two main forms.

A disturbance that travels through a medium with a transfer of matter and without a transfer of energy best describes a wave.

The primary distinction between transverse and longitudinal waves is that in transverse waves, wave particles travel perpendicular to the wave's direction, but in longitudinal waves, wave particles move horizontally.

A wave is a medium that carries energy through space. Some waves travel through empty space. Other waves must travel through a material, also known as an energy. Waves transfer energy but not matter.

Hence, the correct answer for the blanks are medium,energy,and matter.

To learn more about the wave, refer to the link;

brainly.com/question/3004869

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Answer:

Infrared

Explanation:

Infrared radiation is the form of light that is invisible to eye but can be felt as warmth.

Electromagnetic radiation has gamma rays, ultraviolet rays, x- rays , visible light and infrared radiation, etc.

The heated surface usually emits infrared radiations .They form a continuous spectrum.

Infra red radiation are used in different processes such as heat sensors, thermal imaging and night vision equipment.

Broadly they can be divided into three group near, middle and long infrared radiations.

These radiations can be seen with the eyes with special equipment or under certain conditions.

Answer:

Double the voltage across it.

Explanation:

From Ohm's Law, we have the relation, as follows:

Voltage = (Current)(Resistance)

If we keep the resistance of the wire as a constant, then we get the relation between voltage and current as follows:

Voltage = (Constant) * Current

Voltage α Current

This shows that the current has a direct proportionality with the voltage. So, if we want to double the current flowing through a piece of metal wire, then we must Double the voltage across it.

It can be confirmed by formula as:

V = IR

Now, doubling the voltage:

V' = 2 IR

substituting value of IR = V:

V' = 2 V

Answer:

power=400Watt

Explanation:

work done =12kJ=12×10³=12000j

time taken=30s

power=?

as we know that

power=work done/time taken

power=12000J/30s

power=400Watt

i hope this will help you :)

Answer: Magnitude of the force exerted on the egg by the ground is 9.2N

Explanation:

Given the following :

Mass of egg (m) = 150g = 0.15kg

Height(h) from which egg is dropped = 3m

velocity of egg before hitting the ground (u) = 4.4m/s

Final velocity of egg (V) = 0

Time taken (t) = 0.072s

Magnitude of the force exerted on the egg by the ground can be found by applying Newton's 2nd law:

Momentum = mass × velocity

From Newton's second law:

Force = mass × change in Velocity with time ;

That is

F = m * ΔV / t

Inputting our values

F = 0.15 * (4.4 - 0) / 0.072

F = 0.15 × (4.4 / 0.072)

F = 0.15 × 61.11

F = 9.16N

F = 9.2N

Answer:

9.2 N

Explanation:

Just took practice quiz

Answer:

6.72 m/s

Explanation:

recall that the equations of motion may be expressed as

v² = u² + 2as

where,

v = final velocity,

u = initial velocity = 0 m/s because it is stationary before it starts falling

a = acceleration (in this case because it is falling, it is the acceleration due to gravity = 9.81 m/s²)

s = distance traveled = 2.3m

in our case, if we neglect air resistance, then we simply substitute the known values above into the equation of motion.

v² = u² + 2as

v² = 0² + 2(9.81)(2.3)

v² = 45.126

v = √45.126

v = 6.72 m/s

Options:

a) An arrow of magnitude 852.6 N points perpendicular to the slope of the hill.

b)  An arrow of magnitude 6.50 N points down the slope of the hill.    

c)  An arrow of magnitude 78.5 N points down the slope of the hill.

d)  An arrow of magnitude 852.6 N points straight down.

Answer:

d)  An arrow of magnitude 852.6 N points straight down.

Explanation:

The total mass of the two riders, m = 87.0 kg

The free body diagrams of the situation described are drawn and contained in the files attached to this solution.

Note that the weight of the toboggan will act directly downwards.

Therefore, the weight of the toboggan, W = mg

W = 87 * 9.8

W = 852.6 N

Since the arrow representing the weight of the toboggan points straight down, the correct answer is that an arrow of magnitude 852.6 N points straight down.

Answer:

When an object is heated it Expand and when it cools it Contract

Explanation:

One of the effect of heat on matter is expansion. An increase in the temperature of an object causes it to expand and a decrease causes it to contract

Answer:

A) q = 5.714 × 10^(13) C

B) Because from a above, F_e = F_g and so r² canceled out in the formulas

C) m_t = 5.964 × 10⁴ kg

Explanation:

For the gravitational attraction of the earth and moon to be neutralized, the electrostatic force must be equal to the gravitational force i.e F_e = F_g

Now, F_e = kq²/r² and F_g = GmM/r²

Equating them and making q the subject, we arrive at;

q = √(GmM/k)

Where;

G is gravitational constant = 6.67 × 10^(-11) m³/kg.s²

m is mass of moon = 7.36 × 10^(22) kg

M is mass of earth = 5.98 × 10^(24) kg

k is coulombs constant = 8.99 x 10^(9) N.m²/c²

q = √(6.67 × 10^(-11) × 7.36 × 10^(22) × 5.98 × 10^(24)/8.99 x 10^(9))

q = 5.714 × 10^(13) C

B) We don't need the lunar distance because from a above, F_e = F_g and so r² canceled out in the formulas.

C) The number of protons is given by the formula;

n = q/e

Where, e is charge of the proton = 1.6 × 10^(-19) C

n = (5.714 × 10^(13))/(1.6 × 10^(-19))

n = 3.57125 × 10^(32)

Total mass of these protons is given by the formula;

m_t = nm_p

Where m_p is mass of a single proton = 1.67 × 10^(-27) kg

m_t = 3.57125 × 10^(32) × 1.67 × 10^(-27)

m_t = 5.964 × 10⁴ kg

Answer:

a) The cylinder has an angular acceleration of 3.810 radians per square second, b) The frictional force has a magnitude of 9 newtons and has the same direction of tension force.

Explanation:

The external force exerted on string creates a tension force that tries to move the cylinder in translation, but it is opposed by the friction force between cylinder and ground that generates rolling on cylinder. The Free Body Motion on cylinder-string system is presented below as attachment. Given that cylinder is a rigid body in planar motion, two equations of equilibrium for translation and an equation of equilibrium for rotation are needed to represent the system, which are now described:

[tex]\Sigma F_{x} = T + f = M\cdot R\cdot \alpha[/tex]

[tex]\Sigma F_{y} = N - M\cdot g = 0[/tex]

[tex]\Sigma M_{G} = (T-f)\cdot R = I_{G}\cdot \alpha[/tex]

Where:

[tex]T[/tex] - Tension, measured in newtons.

[tex]f[/tex] - Friction force, measured in newtons.

[tex]M[/tex] - Mass of the cylinder, measured in kilograms.

[tex]R[/tex] - Radius of the cylinder, measured in meters.

[tex]\alpha[/tex] - Angular acceleration, measured in radians per square second.

[tex]N[/tex] - Normal force from ground exerted on cylinder, measured in newtons.

[tex]g[/tex] - Gravitational acceleration, measured in meters per square second.

[tex]I_{G}[/tex] - Moment of inertia of the cylinder with respect to its center of mass, measured in kilogram-square meters.

The moment of inertia of the cylinder is:

[tex]I_{G} = \frac{1}{2}\cdot M\cdot R^{2}[/tex]

a) The angular acceleration is determined by solving on first and third equation after eliminating  friction force:

[tex]f = M\cdot R \cdot \alpha - T[/tex]

[tex](T-M\cdot R\cdot \alpha+T) \cdot R = I_{G}\cdot \alpha[/tex]

[tex]2\cdot T\cdot R = (I_{G} + M\cdot R^{2})\cdot \alpha[/tex]

[tex]\alpha = \frac{2\cdot T\cdot R}{I_{G}+M\cdot R^{2}}[/tex]

[tex]\alpha = \frac{2\cdot T \cdot R}{\frac{1}{2}\cdot M\cdot R^{2}+M\cdot R^{2} }[/tex]

[tex]\alpha = \frac{4\cdot T}{3\cdot M\cdot R}[/tex]

If [tex]T = 3\,N[/tex], [tex]M = 7\,kg[/tex] and [tex]R = 0.45\,m[/tex], then:

[tex]\alpha = \frac{4\cdot (3\,N)}{(7\,kg)\cdot (0.45\,m)}[/tex]

[tex]\alpha = 3.810\,\frac{rad}{s^{2}}[/tex]

The cylinder has an angular acceleration of 3.810 radians per square second.

b) The magnitude of the frictional force can be determined with the help of the following expression:

[tex]f = M\cdot R \cdot \alpha - T[/tex]

Given that [tex]T = 3\,N[/tex], [tex]M = 7\,kg[/tex], [tex]R = 0.45\,m[/tex] and [tex]\alpha = 3.810\,\frac{rad}{s^{2}}[/tex], the magnitude of the friction force is:

[tex]f = (7\,kg)\cdot (0.45\,m)\cdot \left(3.810\,\frac{rad}{s^{2}} \right)-3\,N[/tex]

[tex]f = 9\,N[/tex]

The frictional force has a magnitude of 9 newtons and has the same direction of tension force.

Answer: No

Explanation:

Whenever light travelling on a straight line encounters obstruction, it diffracts and scatter.

Scattering of light occurs when light passes through a rough path or a diffused surface.

But in case of spectral diffusion, which is the fluctuation in spectroscopy as a result of time dependent frequency shifts.

Spectral diffusion occurs in particular molecules initiated by excessive excitation energy.

Fluctuation in frequency does not mean diffraction of light or particles

Therefore, spectral diffusion does not cause light to scatter.

Answer:

6.67×10⁻⁸ cm³/g/s²

Explanation:

6.67×10⁻¹¹ Nm²/kg²

= 6.67×10⁻¹¹ (kg m/s²) m²/kg²

= 6.67×10⁻¹¹ m³/kg/s²

= 6.67×10⁻¹¹ m³/kg/s² × (100 cm/m)³ × (1 kg / 1000 g)

= 6.67×10⁻⁸ cm³/g/s²

Answer:

Explanation:

Seismograph is an instrument that measures and records details of earthquakes

How does it work???

The instrument is simply a vibrating rod, or a pendulum, which

starts vibrating when tremors occur. A pen is attached to the vibrating system.

The pen records the seismic waves on a paper which moves under it. By studying

these waves, scientists can construct a complete map of the earthquake

Answer:

I = 9.17 A

Explanation:

We have,

Power of a stove is 2.2 kW

Voltage on which it operates is 240 V

Let us assume that it is required to find the current flowing in the circuit. Electric power is given by :

[tex]P=IV\\\\I=\dfrac{P}{V}\\\\I=\dfrac{2.2\times 10^3}{240}\\\\I=9.17\ A[/tex]

So, the current in the stove burner is 9.17 A.

Answer:

[tex] \boxed{\sf Final \ velocity = 20 \ m/s} [/tex]

Given:

Initial velocity (u) = 0 m/s

Acceleration (a) = 2 m/s²

Time taken (t) = 10 seconds

To Find:

Final velocity (v)

Explanation:

[tex]\sf From \ equation \ of \ motion: \\ \sf v = u + at \\ \\ \sf v = 0 + 2(10) \\ \\ \sf v = 2 \times 10 \\ \\ \sf v = 20 \ m/s[/tex]