Please help me with this question

Answer:

1.8m/s2

Explanation:

force=mass x acceleration

so,

acceleration=force /mass

=45/25

=1.8

Answer:

322.6 m/s

Explanation:

Given that there are two components of position;

x= vot

y component is;

y= 1.9 - gt^2/2

When the bullet hits the ground, y=0

1.9 -gt^2/2 =0

Where g = 10ms^-2

t= √2 × 1.9/10

t= 0.62 secs

Therefore,

x= vot

vo = x/t

Where, x= 200 m

vo= 200/0.62 =

vo= 322.6 m/s

Answer:

The total distance covered by the car is 3,810.08 m

Explanation:

Given;

initial speed of the car, u = 72 km/hr = 20 m/s

initial time, t₁ = 15 minutes = 900 s

final speed of the car, v = 80 km/hr = 22.22 m/s

final time, t₂ = 12 minutes = 720 s

The acceleration of the car is given as;

[tex]a = \frac{v-u}{t_2 -t_1} \\\\a = \frac{22.22-20}{900-720}\\\\a = 0.0123 \ m/s^2[/tex]

The total distance covered by the car is given as;

v² = u² + 2as

where;

s is the total distance covered by the car

22.22² = 20² + 2(0.0123)s

22.22²  - 20² = 2(0.0123)s

93.728 = 0.0246s

s = 93.728 / 0.0246

s = 3,810.08 m

Therefore, the total distance covered by the car is 3,810.08 m

Answer:

34 km

Explanation:

Remark

You are dealing with distance not direction. So you just figure out the two parts separately and add.

15 minutes

t = 15 minutes * 1 hour / 60 minutes = 0.25 hours.

r = 72 km / hr

d = 72 km / hr * 0.25 hours

d = 18 km

12 minutes

t = 12 minutes * 1 hour/ 60 minutes = 0.2 hours

r = 80 km/hour

d = 80 * 0.2 = 16 km

Total distance

d = d1 + d2

d = 18 + 16 = 34 km

Answer:

it would be horrible

Explanation:

yeah

Answer:

O the bystander effect.

Explanation:

In psychology, bystander effect is a theory that explains the unwillingness of a person to render help due to the presence of others. This theory explains that there is every tendency to help a victim in need when others are not there but act contrarily in the presence of others.

This is the case in this question where someone collapsed and laid helplessly on the floor due to difficulty in breathing. People walked past this victim without rendering assistance, however, a young lady who was about to help also walked past when she noticed that others were there and not offering help. This young lady has just portrayed the "BYSTANDER EFFECT".

Explanation:

Vf=Vi+at

reference frame,take down as positive in y- axis

Data

Vi=0m/s

Vf=?

a=g(9.8m/s2)

t=6s

Vf=0+9.8m/s2*6s

Vf=58.8m/s

The velocity of the object after falling for 6 s from a high building is 58.8 m/s

Initial velocity (u) = 0 m/s

Time (t) = 6 s

Acceleration due to gravity (g) = 9.8 m/s²

v = 0 + (9.8 × 6)

v = 0 + 58.8

Therefore, the velocity of the object after falling for 6 s is 58.8 m/s

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The conclusion supports the thermogram will be that the windows are not energy efficient, but the roof is energy efficient.

Thermography is a noninvasive method that employs an infrared camera to generate pictures  that depict patterns of heat and blood flow on or near the body's surface.

A thermogram taken outside a house shows high amounts of thermal energy around the windows but not around the roof.

The conclusion supports the thermogram will be that the windows are not energy efficient, but the roof is energy efficient.

Hence option c is correct.

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If you dont want to read all of that it is option C

Power can be defined as the rate at which energy is converted per unit time

and the formula is given below

Power = Force × Velocity

In a machine, there are series of energy conversion which takes place to

ensure work is done to achieve a goal. When the machine works fast, the

energy conversion increases with time.

The increase in energy conversion depicts that more work is done and the

machine has more power.

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Answer:

Explanation:

Frictional force can be defined as the force that is generated by two surfaces which are in contact with each other and even goes ahead to slide against each other. It can also be simply defined as a force that oppose the sliding of one object over the other

There are different types of frictional forces such as dry friction, lubricated friction, internal friction, fluid friction etc. One of the factors that affects frictional forces is that the forces are majorly affected by the surface texture and amount of force that bounds them together.

Answer:

Acceleration is the rate of change of velocity of an object.

Formula: Had to take a picture of the formula

Answer:

Acceleration is the rate of change of velocity of an object.

Formula:

[tex]a=\frac{v-v_{0} }{t}[/tex]

The formula is basically the change in velocity over the time

a is the acceleration

v is the final velocity

v0 is the starting/initial velocity

t is the time elapsed

Hope this helps :)

Explanation:

Speed

= Wavelength * Frequency

= 340m * 2.5Hz

= 850m/s

Answer:

Apparent Motion

Explanation:

Apparent Motion of a star is a scientific term that describes the phenomenon that is observed as a result of the earth's rotation which is based on the area or where the observer is situated, and then the point at which the star is found comparable to the rotation axis of the earth.

This often makes the start to appear like it's moving across the sky.

Hence, A star has APPARENT MOTION; it appears to be moving across the sky as the night progresses.

Answer:

he will not be drowned

Explanation:

Question says , the height of the student = 4 feet,

Depth of the pool( in feet ) be x ( say ) which is less than  4 feet,

Clearly, the depth of the pool < height of the student,

This means, if the student goes for swimming in the pool, however he does not know swimming, he will not be drowned until he is suffering from an injury or external force.

Answer:

28.4

Explanation:

for those on acellus

The acceleration of the puck is the rate of change in velocity of the puck. The acceleration is obtained as 9.06 m/s².

Acceleration of an object is its rate of change in velocity. It is a vector quantity, thus, having both magnitude and direction.

The velocity components is given

2.35 m/s in direction of 22° and 6.42 m/s in a direction of 50°.

Thus, initial velocity u = 2.35 cos 22 = 2.17 m/s

final velocity V = 6.42 cos 50 = 4.12 m/s

Hence, the change in velocity = V - U

= 4.12 - 2.17 = 1.95 m/s.

The time change is given ΔT = 0.215 s.

ΔV = 1.95 m/s

Thus, acceleration = ΔV / ΔT

= 1.95 m/s / 0.215 s

= 9.06  m/s².

Therefore, the acceleration of the puck is  9.06 m/s².

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Fricition opposes the pushing force, so the net force is

10 N - 2 N = 8 N

to the right.

Answer:

Explanation:

The momentum of an object can be found by using the formula

momentum = mass × velocity

From the question we have

momentum = 100 × 2

We have the final answer as

Hope this helps you

Answer:

=720000kgm/s

Explanation:

The impuse is equivalent to the rate of change of momentum which is expressed below as

Impulse= mv2 - mv1

=m(V2 - V1)

V1= initial velocity= 242 m/s

V2=final velocity= 258 m/s?

m= mass of the plane =45,000 kg

Then if we input the values, we have,

= 45000(258-242)

=720000kgm/s

Hence,the impulse on a 45,000 kg airplane is 720000kgm/s

Hello, for this applicate formula:

Vf² = Vo² + 2gh

Data:

Vf = Final Velocity = ¿?

Vo = Initial veloctiy = 0 m/s

g = Gravity = 9,81 m/s²

h = Height = 5 m

Replacing according our data:

Vf² = 0 m/s² + 2(9,81 m/s²)(5 m)

Vf² = 98,1 m²/s²

Vf = √98,1 m²/s²

Vf = 9,9 m/s

The final velocity will be 9,9 meters per second.

The answer is 9.9 m/s

Answer:

The car drives 108 m

Answer:

[tex]\boxed{\pink{\sf Velocity \ of \ the \ body \ is \ 30m/s .}}[/tex]

Explanation:

Given that a body is moving which has a mass of 100g. And its Kinetic energy is 45 Joules . We need to find its velocity . So ,

[tex]\boxed{\red{\bf Kinetic\: Energy =\dfrac{1}{2}mv^2 }}[/tex]

Now here mass is in grams. So converting it into SI units we have , 100/1000 kg = 0.1 kg

[tex]\implies KE =\dfrac{1}{2}mv^2 \\\\\implies 45 J = \dfrac{1}{2}\times \dfrac{1}{10} kg \times v^2 \\\\\implies v^2 = 45 \times 20 \\\\\implies v^2 = 900 m^2/s^2 \\\\\implies v =\sqrt{900 m^2/s^2} \\\\\underline{\boxed{\blue{\tt \implies Velocity = 30m/s }}}[/tex]

Answer:

3.75 m/s

Explanation:

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

Acceleration (a) = 1.5 m/s²

Initial velocity (u) = 0 m/s

Time (t) = 2.5 s

Final velocity (v) =?

a = (v – u) / t

1.5 = (v – 0) / 2.5

1.5 = v / 2.5

Cross multiply

v = 1.5 × 2.5

v = 3.75 m/s

Hence, the escape velocity of the squirrel is 3.75 m/s

Answer:1.35

Explanation:

The mechanical advantage of the lever shown in the question is 1.27. Mechanical advantage is the force amplified by a mechanical tool. Thus, the correct option is B.

Mechanical advantage is the measure of the force amplification which is achieved by using a tool such as, a mechanical device or machine system. The mechanical device trades off input forces against the movement to obtain a desired amplification in the output force of the system.

Mechanical advantage of the lever is simply the ratio of the effort arm to the load arm. Effort arm is the distance from the pivot to the point of application of the force while the load arm is the distance of the lord from the pivot point.

Therefore, the effort arm is 0.27m while the load arm is 0.2 m. Mechanical advantage is calculated through the formula:

MA=effort arm/load arm

MA = 0.27/0.2

MA = 1.35 which is close to 1.27

Therefore, the correct option is B.

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Your question is incomplete, most probably the complete question is:

What is the mechanical advantage of the level shown below?

A. 0.79

B. 1.27

C. 2.6

D. 3.67

Answer:

Buddhist monks traveled from india to china and because of their beliefs they weren't allowed to use weapons.

Explanation:Ez

Answer:

They are spherical and hollow (not compact or dense)

Explanation:

An elastic collision is a form of a collision where kinetic energy and momentum are conserved in the process. When there is zero loss of kinetic energy and momentum, it is called a perfectly elastic collision.

This form of collision is observed in atmospheric gases and colliding balls which happens to be spherical and hollow.

The resulting acceleration is 6m/s^2 , when a net force of 18 N is applied to a 3.0 kg mass.

Fnet = 18N

m= 3kg

Fnet = ma

18 = 3a

6m/s^2 = a

"Acceleration is the rate of change of the velocity of an object with respect to time. Accelerations are vector quantities. The orientation of an object's acceleration is given by the orientation of the net force acting on that object."

"A force is an influence that can change the motion of an object. A force can cause an object with mass to change its velocity, i.e., to accelerate. Force can also be described intuitively as a push or a pull. A force has both magnitude and direction, making it a vector quantity."

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Answer:

Amount of current (I) = 2 Amperes

Explanation:

Given:

Coulomb charge = 360 C

Time = 3 min = 3 x 60 sec = 180 sec

Find:

Amount of current

Computation:

Amount of current (I) = Coulomb charge / Time

Amount of current (I) = 360 / 180

Amount of current (I) = 2 Amperes

Answer:

group 0

Explanation:

it might be xenon (Xe)

According to the electronic configuration, and assuming the element to be halogen it is most likely to be grouped with potassium as halogens are  in need of one electron  which is  easily made available by potassium.

Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.

Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.

Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.

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Answer:

here, v = 0, a = - 9.8 m/sec^2, t = 3 sec

v = u + at

0 = u + (-9.8) * 3

0 = u - 29.4

u = 29.4 m/sec

here, u = 29.4m/s, t = 3sec, a= -9.8m/s^2

s = ut + 1/2 a t^2

s = 29.4 * 3 + 1/2 * - 9.8 * 3^2

s = 88.2 - 4.9 * 9

s = 88.2 - 44.1

s = 44.1 m

here, u = 0, a = 9.8m/s^2, t = 1 sec, s = ?

position after 4sec :

s = ut+ 1/2 at^2

s = 0 * 1 + 1/2 * 9.8 * 1^2

s = 4.9m

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