a) Calculate the magnitude of displacement of the car in 40 seconds. b) During which part of the journey was the car accelerating? c) Calculate the magnitude of average velocity of the car.

Answer:

C

Explanation:

Answer:

C)  The gravity on the Moon is less than the gravity on Earth.

Explanation:

Since Moon is smaller than Earth, any mass on Moon will experience less gravitational force and so that mass will weigh less on Moon.

Answer:

We have that θ is the angle that makes the normal of the loop and the direction of the magnetic field.

This means that if θ = 0°, the plane in which the loop of wire lies is totally perpendicular to the magnetic field. (or the face of the loop points in the same direction than the field)

Now, the magnetic flux can be calculated as:

[tex]\int\limits^} \,B.dA[/tex]

Where dA is the differential of area, and we have a dot product, then we have:

B.dA = B*Acos(θ)ds

ds is a differential of surface.

Now, the flux will be maximum when cos(θ) is also a maximum.

And the maximum of the cosine is:

Cos(0°) = 1.

decreasing until cos(90°) = 0

Now, the options given are:

30°, 45°, 60° and 90°.

Then in this range, the maximum flux will occur at the angle closer to 0°, then the correct option is θ = 30°

Answer:

F = 9 N

Explanation:

We have,

Mass of a ball is 2 kg

The radius of the circle the ball travels around is 2 m

Let the velocity of the ball is 3 m/s

It is required to find the centripetal force on the ball. The force that is required to move an object in circular path is called centripetal force.

[tex]F=\dfrac{mv^2}{r}\\\\F=\dfrac{2\times (3)^2}{2}\\\\F=9\ N[/tex]

So, the centripetal force on the ball is 9 N.

Answer:

Atomic clocks are the most accurate time and frequency standards known, and are used as primary standards for international time distribution services, to control the wave frequency of television broadcasts, and in global navigation satellite systems such as GPS.

Answer:

72 W

Explanation:

60% is wasted, or:

0.60 (120 W) = 72 W

Answer:

do you mind telling me what is it your asking so i can help ?

Explanation:

EXAMPLE

BIKE/STROLLER - WHEEL AND AXLE

SCISSORS/HEDGE CUTTER - LEVER

STAIRS - INCLINED PLANED

SCREW DRIVER/SCREW/NAILS- SCREW

AXE - WEDGE

WELL - PULLEY

Its not much but hope this help you

Answer: minimum speed of launch must be 7.45m/s

Explanation:

Given the following:

Height or distance (s) = 2.83m

The final velocity(Vf) at maximum height = 0

Upward motion, acceleration due to gravity(g) us negative = -9.8m/s^2

From the 3rd equation of motion:

V^2 = u^2 - 2gs

Where V = final velocity

u = initial velocity

Therefore, u = Vi

u = √Vf^2 - 2gs

u = √0^2 - 2(-9.8)(2.83)

u = √0 + 55.468

u = √55.468

u = 7.4476 m/s

u = 7.45m/s

Answer:

Explanation:

Answer:

4

Explanation:

X would be armature.

Y is the brush because when z moves the circuits, the brush moves with it

the commutator helps turn the circuits, so that would be z.

Answer:

The World is now characterized by a large network of satellites delivering continuous wireless communications.

Explanation:

Initially created for the military purpose the global positioning system ( GPS) for precision navigation and targeting of weapons, it has become an everyday catch for communication purposes around the globe. Infrared ear thermometers which are a NASA-derived innovation, estimate the concentration of energy emitted by the eardrum in the same way that the temperature of the planetary objects is measured. Consumer products such as compact wireless vacuums, compress-dried foods, memory foam, cordless headsets, LED lighting, scratch-resistant eyeglass lenses, and several other commonly associated products all have benefited from research and innovation in space technology. Modern laptops are direct descendants of The Shuttle Portable Onboard Computer which was designed for the space shuttle programs in the early 1980s. 

The Available options are:

A. Award an indirect free kick to Team B for incidental contact.

B.  Award a direct free kick to Team B.

C.  Allow play to continue as the handling was incidental but issue a caution to the player at the next stoppage of play.  

D.  Allow play to continue.

Answer:

Allow play to continue.

Explanation:

IFAB (International Football Association Board) has approved various means to clarify the issue of handball in foodtball.

Hence, some of the cases include:

1. Should the the ball touches a player's hand/arm immediately from their own head/body/foot or the head/body/foot of another player.

2. the ball touches a player's hand/arm close to their body and has not made their silhouette unnaturally bigger.

3. a player is falling and the ball touches their hand/arm when it is between their body and the ground (but not extended to make the body bigger).

4. Additionally, should the goalkeeper attempt to clear a ball from a teammate but fails, the goalkeeper is allowed to handle the ball.

Hemce, Since a14 who did not see the ball coming and the ball strikes her in the back of the hand as her hand is at her side. the proper call would be to: ALLOW PLAY CONTINUE

Answer:

1 mm

Explanation:

E = ½ kx²

0.025 J = ½ (50,000 N/m) x²

x = 0.001 m

x = 1 mm

Answer:

"Coal has many important uses worldwide. The most significant uses of coal are in electricity generation, steel production, cement manufacturing and as a liquid fuel. Different types of coal have different uses. Steam coal - also known as thermal coal - is mainly used in power generation."

Explanation:

Answer:

Coal can be used for many things. Mostly though, to help steel production. For example, electricity generation. They can also be used for cemet as a liquid fuel. There are many types of coals with different purposes.

Answer:

gas is non-renewable resource

Explanation:

Answer:

Gas

Explanation:

There are two types of energy sources, renewable and non-renewable.

Solar energy, wind energy, and hydroelectric are an example of renewable energy.

Fossil fuels like gas, coal, and petroleum are an example of non-renewable energy.

Answer:

gamma rays, ultraviolet, infrared, radio

Explanation:

Because on the Electromagnetic spectrum wavelength increases from the gamma end to radio end and frequency decrease in that order

Answer:

radio → infrared → ultraviolet → gamma

Explanation: yeaaahhh its c

Answer:

Women are now allowed to participate in the Olympics. The original Olympic Games were open only to men.

Modern Olympic Games include many more events. The first Olympics included only a running event. Today, there are more than 20 different sports and almost 300 events.

The Olympics are held every two years, alternating between summer and winter. The ancient Olympics were originally held every four years in Olympia.

Athletes from countries around the world participate in the modern Olympics. The ancient Olympics consisted of athletes only from ancient Greece.

Explanation:

plato

Answer:

because lwhen they are made longer than the turning effect of force is more and its easy to work it out.

The given question is incomplete as the essential graphical result is missing, however the correct graph is attached with the answer :

Answer:

The correct answer is - According to the graph,  the current in the LDR is directly proportional to the potential difference across the LDR.

Explanation:

Two variables that are in directly proportion will consistently deliver a straight-line graph that goes through the beginning. On the off chance that the steady of proportionality is sure, the chart will have a positive slope. On the off chance that the steady is negative, the graph will have a negative angle.

In the given data and graph of the result collected by the student shows a straight line in between the current in the LDR and the potential difference across the LDR. It means they are in relation of directly proportional.

Thus, the correct answer is - According to the graph,  the current in the LDR is directly proportional to the potential difference across the LDR.

Answer:

-0.08m/s²

Explanation:

Answer:

1 Pa

Explanation:

Pressure = Force/Area

P = 200/200

P = 1

The SI unit is Pa for pressure, one newton per square meter.

Answer:

v = 4.03 m/s

Explanation:

It is given that,

Distance covered by a lizard, d = 2.1 m

Time taken by lizard, t = 0.52 s

We need to find the average speed of the lizard. The distance covered divided by time taken is called the average speed of lizard. So,

[tex]v=\dfrac{d}{t}\\\\v=\dfrac{2.1\ m}{0.52\ s}\\\\v=4.03\ m/s[/tex]

So, the average speed of the lizard is 4.03 m/s.

Answer: 4.02 not 4.03

Explanation: I did on khan academy

Answer:

Explanation:

Mechanical advantage (M.A)of a machine is the ratio of load to effort

M.A= 5.5

load= 480N

effort= ?

Applying the formula and substituting to find the effort we have

[tex]M.A= \frac{load}{effort}[/tex]

[tex]5.5= \frac{480}{effort}\\\effort= \frac{480}{5.5} \\\effort= 87.27N[/tex]

Answer:

340 kg/m³

Explanation:

[tex]Relative density \: = \frac{density \: ofsubstance}{density \: of \: equal \: volume \: ofwater} [/tex]

density of water = 1000 kg/m³

density of the liquid = 0.34 × 1000

= 340 kg/m³

Answer:

Output work is always less than input work due to effect of friction. Machines are frictionless in practice, the efficiency of a machine can never be 100%.

Hope this helps..

Good luck on your assignment..

Answer:

Friction

Explanation:

Answer:

The correct option is;

(A) 25.8 cmHg

Explanation:

The given parameters are;

The height of the mountain over which the eagle is flying = 2700 m

The average density of air, ρₐ = 1.3 kg/m³

The atmospheric pressure at sea level = 76 cmHg = 0.76 mHg

The density of mercury, [tex]\rho _m[/tex] = 13,600 kg/m³

The formula for pressure, p, is p = ρ·g·h

The pressure in the atmosphere = 13,600 × 0.76 × g = 10,336·g

The equivalent height of air is found as follows;

1.3 × g × h = 10,336·g

h = 10,336/1.3 = 7,950.769 meters

Therefore;

The pressure of the atmosphere at 2,700 meters, p₂₇₀₀ = (2,700/7,950.769) × 76 cm Hg

Which gives;

p₂₇₀₀ = 25.808 cmHg ≈ 25.8 cmHg.

Answer:

160 m

Explanation:

For computing the distance first we have to determine the acceleration which is shown below:

v = u + at

where,

v = 0 = initial velocity

u = 40 = uniformly to a speed

t = 8 = time

So, the a is

= 40 ÷ 8

= 5 m/s

Now we have to use the distance formula i.e

d = ut + 1 ÷ 2 at^2

= 1 ÷2 × 5 × 8^2

= 160 m

Basically we have to applied the above formulas so that the distance could come

Answer:

the angular acceleration of the gate is approximately 1.61  [tex]\frac{rad}{s^2}[/tex]

Explanation:

Recall the formula that connects the net torque with the moment of inertia of a rotating object about its axis of rotation, and the angular acceleration (similar to Newton's second law with net force, mass, and linear acceleration):

[tex]\sum \tau_1=I\,\alpha[/tex]

In our case, both forces contribute to the same direction of torque, so we can add their torques up and get the net torque on the gate:

[tex]\tau_{net}=(20*2+30*3.5) \,N\,m=145\,\,N\,m[/tex]

Now we use this value to obtain the angular acceleration by using the given moment of inertia of the rotating gate:

[tex]\sum \tau_1=I\,\alpha\\145\,\,N\.m=(90\,\,kg\,m^2)\,\alpha\\\alpha= \frac{145}{90} \frac{rad}{s^2} = 1.61\, \frac{rad}{s^2}[/tex]

Answer:

D. not enough information to decide

Explanation:

i dont understand >.<