All categories

3 years ago

A car is moving from rest and the velocity increases to 30 m/s in 4 seconds. Calculate its acceleration.

Physics

1 answer:

vaieri [72.5K]3 years ago

8 0

Answer:

7.5 m/s²

Explanation:

Given:

v₀ = 0 m/s

v = 30 m/s

t = 4 s

Find: a

v = at + v₀

(30 m/s) = a (4 s) + (0 m/s)

a = 7.5 m/s²

You might be interested in

the capacity of computer of performing more than one task at the same time is called ............of computer.

jolli1 [7]

Answer:

We conclude that the capacity of the computer of performing more than one task at the same time is called the versatility of the computer.

Explanation:

We know that when a PC or laptop is capable of doing multiple tasks at the same time, this particular characteristic of a computer is termed as the versatility of the computer.

In other words, the versatility of the computer makes sure the computer or PC can do multitasking at the same time.

The versatility of a computer makes sure the machine can perform different types of works completed at the same time.

For example, using a computer, we can listen to music while playing games at the same time.

Therefore, we conclude that the capacity of the computer of performing more than one task at the same time is called the versatility of the computer.

8 0

2 years ago

DANIEL HAS A SAMPLE OF PURE COPPER. ITS MASS IS 89.6 GRAMS, AND ITS VOLUME IS 10 CUBIC CENTIMETERS. WHATS THE DENSITY OF THE SAM

Vitek1552 [10]

So the formula for density is mass divided by volume, so it would be

6 0

3 years ago

Read 2 more answers

Please helpp!! Questions 1-5

Fofino [41]

Answer:

A:Time (minutes)

B: Temp(degrees c)

2. Downward trend (temperature goes down as time goes on )

A: not sure

B: temperature

4.the temperature is going down

5. Closes off any open airways

6 0

3 years ago

Give two example for push or pull to change the state of motion of time two examples

dolphi86 [110]

Explanation:

An Example of push as a force would be to push on a swing. The force moves the swing in a particular direction and the harder that you push the further the swing will go.

An example of pull as a force would be opening a door. ...

An example of pressure as a force is when you push down on a pile of grapes. is this what you mean

4 0

3 years ago

A 200 kg weather rocket is loaded with 100 kg of fuel and fired straight up. It accelerates upward at 35 m/s2 for 35 s , then ru

r-ruslan [8.4K]

Answer:

T = 295.57 s

Explanation:

given,

mass of the rocket = 200 Kg

mass of the fuel = 100 Kg

acceleration = 35 m/s²

time, t = 35 s

time taken by the rocket to hit the ground, = ?

Final speed of the rocket when fuel is empty

using equation of motion

v = u + a t

v = 0 + 35 x 35

v = 1225 m/s

height of the rocket where fuel is empty

v² = u² + 2 a s

1225² = 0 + 2 x 35 x h₁

h₁ = 21437.5 m

After 35 s the rocket will be moving upward till the final velocity becomes zero.

Now, using equation of motion to find the height after 35 s

v² = u² + 2 g h₂

0² = 1225² + 2 x (-9.8) h₂

h₂ = 76562.5 m

total height = h₁ + h₂

= 76562.5 m + 21437.5 m = 98000 m

now, time taken by before the rocket hit the ground

using equation of motion

$s = u t +\dfrac{1}{2}at^2$

$-13500 = 1225 t -\dfrac{1}{2}\times 9.8 \times t^2$

negative sign is used because the distance travel by the rocket is downward.

4.9 t² - 1225 t - 13500 = 0

$t = \dfrac{-(-1225)\pm \sqrt{1225^2 - 4\times 4.9 \times (-13500)}}{2\times 4.9}$

t = 260.57 s

neglecting the negative sign

total time the rocket was in air

T = t₁ + t₂

T = 35 + 260.57

T = 295.57 s

Time for which rocket was in air is equal to 295.57 s.

6 0

3 years ago