Which or the following is a science ? A. Physics B.astrology C. Football statics D. Language studies

the pilot of a new stealth helicopter which has a mass of 15000 kg and was traveling 180 m / s accelerated to 250 m / s in six s

MariettaO [177]

Answer:

pf = 3750000 kg.m/s

F = 175000 N

Explanation:

Constant Acceleration

An object moves with constant acceleration if its velocity changes uniformly in time.

If we call vo to the initial speed, vf the final speed, and t the time, then the acceleration is calculated as:

$\displaystyle a=\frac{v_f-v_o}{t}$

The new stealth helicopter was traveling at vo=180m/s and changed to vf=250 m/s in t=6 seconds, thus the acceleration was:

$\displaystyle a=\frac{250-180}{6}$

$a=11.67~m/s^2$

Please note this number is shown rounded to the nearest hundredth, but it was stored in the calculator's memory with full precision. This fact affects the next calculation as will be noted below.

The acceleration must be produced for some net force that can be calculated by:

F = m.a

Where m=15000 Kg is the mass of the helicopter. Thus:

F = 15000 * 11.67

F = 175000 N

The above product would lead to the inaccurate result of 175050 if the acceleration would have not used with its full representation in the calculator's memory.

The momentum of an object of mass m and velocity v is:

p = m. v

The final momentum of the helicopter is:

pf = m.vf = 15000*250 m/s

pf = 3750000 kg.m/s

Note: When performing calculations over intermediate results, it's important to keep them as accurate as possible to preserve the accuracy of the final result.

6 0

3 years ago

Nuclear fusion is the combining of atomic nuclei to produce energy and

GenaCL600 [577]

Answer:

D) Radiation

Explanation:

Nuclear fusion is the combining of atomic nuclei to produce energy and radiation.

5 0

3 years ago

What is the acceleration of a 45 kg mass pushed with 15 N of force? What is the acceleration if the force changes to 25 N? What

Rama09 [41]

F = ma
Rearrange this so acceleration is the subject:
A = f/m

Now input your values into this equation for the first question :
A = f/m
A = 15/45
A = 0.33333333 m/s

Then using this same equation change the force of 15 to 25 :
A = f/m
A = 25/45
A = 0.55555556 m/s

For the last question keep the force of 15N but change the mass to 70kg into the same equation :
A = f/m
A = 15/70
A = 0.21 m/s (rounded)

8 0

3 years ago

Read 2 more answers

015 10.0 points

Salsk061 [2.6K]

Answer:

20.996 m

Explanation:

Given:

Initial velocity, $u=0 \textrm{ m/s}$

Final velocity, $v=12.4062 \textrm{ m/s}$

Total time taken, $t_{Total} = 7.13$ s.

∴ Acceleration is given as,

$a=\frac{v-u}{t_{Total}}=\frac{12.4062-0}{7.13}=1.74$ m/s²

Now, using Newton's equation of motion, we find the displacement.

Displacement is given as:

$s=ut+\frac{1}{2} at^{2}$

Plug in 0 for $u$ , 4.91257 for $t$ and 1.74 for $a$ . Solve for $s$ .

This gives,

$s=0+\frac{1}{2} \times 1.74 \times (4.91257)^{2}=20.996 \textrm{ m}$

Therefore, the train's displacement in the first 4.91257 s of motion is 20.996 m.

7 0

3 years ago

Divers in Acapulco dive from a cliff that is 65 m high. If the rocks

Alex777 [14]

Answer:

Cool question! First step is to find the time taken to fall

57

m

, then to find the horizontal velocity needed to cover

24

m

in that time. In this case the answer is

7.0

m

s

−

1

.

Explanation:

This is a less typical projectile motion question, but it's still projectile motion. This means the horizontal and vertical directions can be considered separately. We assume that the initial vertical velocity,

u

y

=

0

m

s

−

1

, and we are trying to find the required initial horizontal velocity,

u

x

.

To find the time taken to fall

57

m

:

s

=

u

t

+

1

2

a

t

2

Since

u

=

0

, we can rearrange this to:

t

=

√

2

s

a

=

√

2

⋅

57

9.8

=

3.41

s

The horizontal velocity will be constant (ignoring air resistance), so to cover

24

m

in

3.41

s

will be given by:

v

=

s

t

→

u

x

=

24

3.41

=

7.0

m

s

−

1

Answer link

5 0

2 years ago