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3 years ago

What is the speed of a car that accelerates at a rate of 10 m/s2 for a total of 25 seconds?

Physics

1 answer:

jeyben [28]3 years ago

5 0

Answer:

Explanation:

The speed of the car can be found by using the formula

where

a is the acceleration

v is the speed

t is the time

From the question we have

v = 10 × 25

We have the final answer as

Hope this helps you

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A rocket takes off from Earth and reaches a speed of 105 m/s in 18.0 s. If the exhaust speed is 1,200 m/sand the mass of fuel bu

Amanda [17]

Answer:

The initial mass of the rocket is 526.2 kg.

Explanation:

Given that,

Final speed = 105 m/s

Time = 18.0 s

Exhaust initial speed = 1200 m/s

Mass of burned fuel = 110 kg

We need to calculate the initial mass

The velocity change of rocket under gravity is defined as,

$v=u\ ln(\dfrac{m_{i}}{m})-gt$ ....(I)

We know that,

$m=m_{i}-m_{bf}$

Put the value of m in equation (I)

$v=u\ ln(\dfrac{m_{i}}{m_{i}-m_{bf}})-gt$

$m_{i}=\dfrac{m_{bf}}{1-e^-{\dfrac{v+gt}{u}}}$

$m_{i}=\dfrac{110}{1- e^-{\frac{105+9.8\times18}{1200}}}$

$m_{i}=526.2 kg$

Hence, The initial mass of the rocket is 526.2 kg.

7 0

3 years ago

3. As the duration of a maximal effort increases from 10 seconds or less to between 10 and 180 seconds, what factor becomes limi

Molodets [167]

Answer:

Anaerobic energy

Explanation:

Anaerobic energy is produced at maximal effort within a very short period, anaerobic energy is energy produced when effort is expended at quick bursts and usually less than 10 seconds.

Therefore, if maximal effort time is increased beyond 10 seconds, the energy produced is not anaerobic and as such, anaerobic energy is limited.

7 0

3 years ago

The power radiated by the sun is 3.90 1026 W. The earth orbits the sun in a nearly circular orbit of radius 1.50 1011 m. The ear

WITCHER [35]

Answer:

3234.2 W

Explanation:

Since intensity I = Power/Area. The intensity of the light from the sun, I = power radiated by sun/area of sphere of radius, r = 1.5 × 10¹¹ m.

So, I = 3.9 10²⁶W/4π(1.5 × 10¹¹ m)² = 2.069 × 10³ W/m².

Now, the power radiated on the patch of area 0.570 m² at the equator is

P = Icos27/A = 2.069 × 10³ W/m² cos27/0.570 m² = 1843.49/0.570 = 3234.2 W

6 0

2 years ago

When is the next total solar eclipse in illinois

atroni [7]

April 8, 2024

Eclipse will be total over the southern part of the state. Roughly everything south of Decatur and Springfield.

7 0

3 years ago

A 70kg man runs at a pace of 4 m/s and a 50g meteor travels at 2 km/s. Which has the most kinetic energy?.

kirill115 [55]

Answer:

the 70kg man

Explanation:

because he has more weight and is moving faster

4 0

3 years ago