help please! this is physics !

Answer:

Explanation:

constant speed is where the speed is the same throughout and instantaneous speed is speed given at any moment and average speed is a total distance traveled divided by the amount of time it took to travel it.

Answer:

Average speed is a measurement of velocity over a period of time.

Constant speed refers to your velocity at any point in time or period

Answer:

300 W

Explanation:

We know that

P = W/t

P = mgh/t

P = 40 × 10 × 3/4

P = 10 × 10 × 3

P = 300 W

Answer:

doctor,health assistant , dentist, psychotherapist , nurse ,etc

Answer:

Force is an external agency that changes or tries to change the position of the body.

Its SI unit is Newton (N).

Answer:

C. The forces are balanced.

Explanation:

Every answer other than C means the object moved.

The time of motion of the bullet is 0.064s.

The horizontal speed of the bullet is 781.25 m/s.

The time of motion of the bullet is the time taken for the bullet traveled from its initial position to the final position and it is calculated as follows;

h = vt + ¹/₂gt²

where;

0.02 = 0 + ¹/₂(9.8)t²

0.02 = 4.9t²

t² = 0.02/4.9

t² = 0.0041

t = √0.0041

t = 0.064 s

The horizontal speed of the bullet is calculated using the following formula shown below;

X = Vₓt

where;

Vₓ = X/t

Vₓ = (50 m) / (0.064)

Vₓ = 781.25 m/s

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Answer:

30m/s

Explanation:

Use the formula

V= d /t

Answer:

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Answer:

The volume of 3200 kg of petrol is 4 m^3.

Answer:

A

Explanation:

Your answer is B. The physical properties have changed, but the chemical properties have not

Hope this helps!

Answer:

when heavy atoms split the loss of mass is converted into kinetic energy

Explanation:

We have that since [tex]F_1[/tex] is moving to the right and its greater

The direction of Net force is  50m/s to the Right

Option A is correct

From the Question we are told that

Force 1 [tex]F_1=100[/tex]

Force 2 [tex]F_2=50[/tex]

Generally the Net force of two forces opposing each other is the difference between them

Therefore

The Net force between Force 1 and 2 is

[tex]F_t=F_1-F_2[/tex]

[tex]F_t=100-50[/tex]

[tex]F_t=50/s[/tex]

In conclusion

Since [tex]F_1[/tex] is moving to the right and its greater

The direction of Net force is  50m/s to the Right

Option A is correct

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Explanation:

[tex]\text{Velocity is defined by the average displacement per unit time. In the time interval }t=8\text{s to }t=12\text{s,}[/tex]

[tex]\text{the velocity, or equivalently the slope of the graph is }\frac{(-4)-(-4)}{12-8}=0[/tex]

[tex]\text{Therefore, the velocity at }t=10\text{s is }0[/tex]

Answer:

0 m/s

Explanation:

The object from 8s to 12s stays at -4m, meaning that it doesn't move in that interval and therefore has zero velocity. Hope this helps!

It would take 0.3639 seconds for this acceleration to occur.

Given the following data:

To find how long it takes for this acceleration to occur, we would use the first equation of motion.

Mathematically, the first equation of motion is given by the formula;

[tex]V = U + at[/tex]

Substituting the values into the equation, we have;

[tex]12.9 = 6.03 + 2.5t\\\\2.5t = 12.9 - 6.03\\\\2.5t = 6.87\\\\t = \frac{2.5}{6.87}[/tex]

Time, t = 0.3639 seconds

Therefore, it would take 0.3639 seconds for this acceleration to occur.

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Answer:

Let d be the density of fluid.

So , Initial reading of balance, F1 =30dg N

After the level reaches 50cm^3

Final reading of balance , F2 =50dg N

Given that difference between final and initial reading is 30g

i.e, F2 −F1

=30 g

⟹50dg−30dg=30g

⟹20dg=30g

⟹d=30g/20g

⟹d=1.5g/cm^3

So, density of fluid is 1.5g/cm^3

Answer:

Insulation helps to prevent that transfer of heat.

The conversion in megayears, hours and seconds are :

[tex]1 \: para \: = \: 3.11 \times {10}^{8} \: megayears[/tex]

[tex]1 \: para \: = \: 2.72 \times {10}^{18} \: hours[/tex]

[tex]1 \: para \: = \: 9.81 \times {10}^{21} \: seconds[/tex]

Given that :

1 para = 311040000000000 years

1 mega year = 1 million years :

311040000000000 years expressed in mega years will be :

Let : number of mega years = p

1 mega year = 1,000,000 years

p = 311040000000000 years

Cross multiply :

311040000000000 × 1 = 1,000,000 × p

311040000000000 = 1000000p

p = 311040000000000 / 1000000

p = 311040000 mega years

p = 3.1104 × 10^8 mega years

[tex]1 \: para \: = \: 3.11 \times {10}^{8} \: megayears[/tex]

In hours :

In hours : 8760 hour = 1 year

Let : number of hours = p

1 year = 8760 hours

311040000000000 years = p

Cross multiply :

p = 8760 × 311040000000000

p = 2724710400000000000

p = 2.72 × 10^18 hours

[tex]1 \: para \: = \: 2.72 \times {10}^{18} \: hours[/tex]

In seconds :

31536000 seconds = 1 year

Let : number of hours = p

1 year = 31536000 seconds

311040000000000 years = p

Cross multiply :

p = 31536000 × 311040000000000

p = 9808957440000000000000

p = 9.81 × 10^21 hours

[tex]1 \: para \: = \: 9.81 \times {10}^{21} \: seconds[/tex]

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Answer:

Power is associated by many people with electricity. Knowing that power is the rate of energy use or energy conversion, what is the expression for electric power? Power transmission lines might come to mind. We also think of lightbulbs in terms of their power ratings in watts. Let us compare a 25-W bulb with a 60-W bulb. (See Figure 1(a).) Since both operate on the same voltage, the 60-W bulb must draw more current to have a greater power rating. Thus the 60-W bulb’s resistance must be lower than that of a 25-W bulb. If we increase voltage, we also increase power. For example, when a 25-W bulb that is designed to operate on 120 V is connected to 240 V, it briefly glows very brightly and then burns out. Precisely how are voltage, current, and resistance related to electric power?

Explanation:

Explanation:

Answer:

yes ,global warming and is changing earth temperature as it increases temperature due to increase of greenhouse gases

Answer:

126.667 °Celsius

Explanation:

260 °Fahrenheit =126.667 °Celsius

Answer:

mathematician, physicist, astronomer, theologian and author.

Explanation:

Greatest mathematician and the most influential scientist of all time.

Answer:

3.03

Explanation:

time=distance/speed

1km=1000m

1000÷330

=3.030

Answer:

The final solution is 38 g.

Explanation:

(2.4 (g / mL)) x 15.82 mL

= 37.96800 grams

When rounded we get 38, so 38 g is the final solution.

Answer:

Object appears to move forward at 1 cm/sec, then the velocity drops to zero for 3 sec and then moves forward at 2 cm/sec     (11 - 3) / (10 - 6) = 2 cm/sec

Answer:

The object moves forward at 1 cm/s, stops, and then increases velocity to 2 cm/s.

Explanation:

Not A because velocity doesn't decrease

Not B because it is not at rest for 4 seconds

C is correct

Not D because it is not always at 1 cm/s

Answer:130.7s

Explanation:

explanation:

Here,

Using Formula;

v = u + at

or, 7 = 0 + (6.6*t)

or, 7 = 6.6t

or 7/6.6 = t

or, t = 1.06s

I think it will help you....