A speed boat travels 200 miles at a speed of 20 miles/hr. How much time will it take to
travel the 200 miles?

Answer:

6.7miles due south

Explanation:

Given parameters:

Time  = 23min(0.383hr)

Average velocity  = 17.5mph

Unknown:

How far he has ridden  = ?

Solution:

To solve this problem,

      Displacement  = Velocity x time

 Displacement = 17.5 x 0.383  = 6.7miles due south

Answer:

$4.2

Explanation:

Given data

Power= 700W

time= 10 hours

Cost per kilowatt hours is cents $0.20

Let us find the number of hours in a month

=24*30

=720 hours

Energ= power*time

Energy= 700/1000*30

Energy= 7*3

Enery= 21 kwh

1 kwh= 0.2

21kwh= x

cross multiply

x=21*0.2

x= $4.2

Answer:

kinetic energy = 1/2mv2

= 1/2 x 2 x 3^2

= 9J

Explanation:

The net force on the mass in the vertical direction is

∑ F = n - w = 0

and the net horizontal force is

∑ F = A - f = ma

where

n = magnitude of the normal force

w = mg = weight of the mass

m = 10 kg, mass of the … uh, mass

g = 9.8 m/s², mag. of acceleration due to gravity

A = 69 N, mag. of the applied force

f = mag. of kinetic friction

From the first equation, we get

n = mg = (10 kg) (9.8 m/s²) = 98 N

Then the friction force has magnitude

f = µ n = 0.5 (98 N) = 49 N

Solve the mass's acceleration in the second equation:

69 N - 49 N = (10 kg) a

a = (20 N) / (10 kg) = 2.0 m/s²

in the positive x direction.

Answer:

The rate at which temperature changes is proportional to the rate at which heat is transferred.

Explanation:

The temperature of a sample changes more rapidly if heat is transferred at a high rate and less rapidly if heat is transferred at a low rate

Answer:

20 kg

Explanation:

The following data were obtained from the question:

Force (F) = 100 N

Acceleration (a) = 5 m/s²

Mass (m) =?

Force (F) is simply defined as the product of mass (m) and acceleration (a). Mathematically, the force (F) can be expressed as:

Force (F) = mass (m) × acceleration (a)

F = ma

With the above formula, we can simply obtain the mass of the object as follow:

Force (F) = 100 N

Acceleration (a) = 5 m/s²

Mass (m) =?

F = ma

100 = m × 5

Divide both side by 5

m = 100 / 5

m = 20 kg

Thus, the mass of the object is 20 kg.

Answer:

It gets a new rock when it is getting older

Explanation:

pls give me brainlyest

Answer:

R = 35.27 Ohms

Explanation:

Given the following data;

Voltage = 230V

Power = 1500W

To find the resistance, R;

Power = V²/R

Where:

V is the voltage measured in volts.

R is the resistance measured in ohms.

Substituting into the equation, we have;

1500 = 230²/R

Cross-multiplying, we have;

1500R = 52900

R = 52900/1500

R = 35.27 Ohms.

Therefore, the resistance which the heating element needs to have​ is 35.27 Ohms.

Answer:

frequency =speed/wavelength

=(3*10^8)/150

=2×10^6

Answer:

R = 35.8 Ω

Explanation:

Recall Ohm's Law:

V = I * R

then R = V / I

in our case:

R = 179 V / 5 A = 35.8 Ω

Answer:

it comes from your knowledge and the information you have to get the reason why that is the answer so you are putting together things that you already know what the new information you have

Answer:

1.52s

Explanation:

Given parameters:

Acceleration  = 63m/s²

Final velocity  = 96m/s

Unknown:

Time taken  = ?

Solution:

To solve this problem, we use one of the kinematics equation:

        v  = u + at

v is the final velocity

u is the initial velocity

a is the acceleration

t is the time taken

So;

           96  =  0 + 63t

             t  = 1.52s

Answer:

50%

Explanation:

Given parameters:

Work output  = 30J

Work input  = 60J

Unknown:

Efficiency of the lever  = ?

Solution:

To solve this problem, the efficiency is taken as the ratio of the work output to that of the work input;

 Efficiency  = Work output / Work input  x 100

Efficiency  = [tex]\frac{30}{60}[/tex]  x 100  = 50%

Answer:

D.

Explanation:

There are three physical properties of matter that involves solid, liquid and gas.

The last statement is correct as it says: boiling and melting points are similar as both changes the physical state of matter. But are different as boiling point changes liquid into gas for example: liquid at high boiling point changes into vapors (gas) and melting point changes solid into liquid for example: ice at high melting point changes into liquid.

Hence, the correct option is "D".

Answer:

Decreases

Explanation:

As an object falls from some height, the gravitational potential energy of the object decreases.

Potential energy is the energy due to the position of a body.

The potential energy is mathematically expressed as:

   Potential energy  = mass x acceleration due to gravity x height

So, potential energy is directly proportional to mass and height.

The higher the mass and height, the more the potential energy.

Answer:

3.678kJ

Explanation:

Given

mass= 75kg

height= 5 m

g= 9.81m/s^2

Required

Potential energy

PE= mgh

substitute

PE= 75*9.81*5

PE=3678.75J

PE= 3.678kJ

Answer:

v = 39.6 m/s (first answer option)

Explanation:

Use conservation of mechanical energy.

The starting is completely potential energy and the final is all kinetic energy:

[tex]m*g*h=\frac{1}{2}*m*v^2\\g * h=\frac{1}{2} v^2\\9.8*80=\frac{1}{2} v^2\\v^2=1568\\v\approx 39.6\,\,m/s[/tex]

which agrees with the first answer shown.

Answer:

Phase Diagram I Think But I Just Searched It Online

Answer:i One way to solve the quadratic equation x2  = 9 is to subtract 9 from both sides to get one side equal to 0: x2  – 9 = 0. The expression on the left can be factored:

Explanation:

Answer:

True

Explanation:

Velocity is a vector quantity, which means that it carries both magnitude and direction. Hence when direction of a particle changes, although magnitude (speed) may remain same, it's velocity changes due to direction change. For ex. A particle is m... A particle is moving along x axis with speed 1m/s, it's velocity will be represented as 1i (i represents unit vector along x)

But if it now starts moving along y axis, it's velocity is 1j (j represents unit vector along y axis). Hence velocity changes with direction.

brainllest pls .

Answer: heat energy, sound energy, and mechanical energy only

Explanation: I did the test in got it right.

Answer:

0.96 gcm¯³

Explanation:

From the question given above, the following data were obtained:

Mass of empty beaker = 103 g

Mass of beaker + water = 361 g

Mass of beaker + oil = 351 g

Density of water = 1 gcm¯³

Density of cooking oil =?

Next, we shall determine the mass of water. This can be obtained as follow:

Mass of empty beaker = 103 g

Mass of beaker + water = 361 g

Mass of water =?

Mass of water = (Mass of beaker + water) – (Mass of empty beaker)

Mass of water = 361 – 103

Mass of water = 258 g

Next, we shall determine the volume of the beaker. This can be obtained by calculating the volume of water in the beaker.

Density of water = 1 gcm¯³

Mass of water = 258 g

Volume of water =?

Density = mass /volume

1 = 258 / volume

Cross multiply

1 × volume = 258

Volume of water = 258 cm³

Thus the volume of the beaker is 258 cm³.

Next, we shall determine the mass of the cooking oil. This can be obtained as follow:

Mass of empty beaker = 103 g

Mass of beaker + oil = 351 g

Mass of cooking oil =?

Mass of cooking oil = (Mass of beaker + oil) – (Mass of empty beaker)

Mass of cooking oil = 351 – 103

Mass of cooking oil = 248 g

Finally, we shall determine the density of the cooking oil. This can be obtained as follow:

Mass of cooking oil = 248 g

Volume of the beaker = 258 cm³

Density of cooking oil =?

Density = mass / volume

Density = 248 / 258

Density of cooking oil = 0.96 gcm¯³

Answer:

Explanation:

The canon is heavier than the canon ball.

Answer:

19.98Joules

Explanation:

Energy possessed by the body is the kinetic energy

Kinetic Energy = 1/2mv²

m is the mass

v is the velocity

For the 4kg moving at 6m/s

kE = 1/2 * 4 * 6^2

KE = 1/2 * 4 * 36

KE = 72Joules

For the 4kg moving at 5.1m/s

kE = 1/2 * 4 * 5.1^2

KE = 1/2 * 4 *26.01

KE = 52.02Joules

Amount of Energy lost = 72 - 52.02

Amount of Energy lost = 19.98Joules

Hence the amount of Energy lost is 19.98Joules

Answer:

1. W = 900 J

2. a = -450000 m/s²

Explanation:

2.

First, we calculate the deceleration of the bullet by using 3rd equation of motion:

[tex]2as = V_{f}^{2} - V_{i}^{2}\\[/tex]

where,

a = deceleration = ?

s = distance traveled = 0.1 m

Vf = Final Speed = 0 m/s (it eventually stops)

Vi = Initial Speed = 300 m/s

Therefore,

[tex]2a(0.1\ m) = (0\ m/s)^{2} - (300\ m/s)^{2}\\a = \frac{-90000\ m^{2}/s^{2}}{0.2\ m}\\\\[/tex]

a = -450000 m/s² (negative sign shows deceleration)

1.

Now, we calculate the force using Newton's Second Law:

[tex]F = ma\\F = (0.02\ kg)(-450000\ m/s^{2})\\F = - 9000\ N[/tex]

Negative sign shows decelerating force.

For work done:

[tex]Work\ Done = W = Fs\\W = (9000 N)(0.1\ m)[/tex]

W = 900 J

Answer:

I'm not 100% sure but I think its Cell membrane

Explanation:

please, correct me if i'm wrong.