All categories

4 years ago

If a car goes along a straight road heading east and speeds up from 45ft/s to 60ft/s in 5s , calculate the acceleration

1 answer:

6 0

Acceleration = change in velocity/ time = (final velocity - initial velocity)/time

<span>accel = (60ft/s - 45ft/s)/5s = 3 ft/s</span>

You might be interested in

An 8 kg mass moving at 8 m/s collides with a 6 kg mass

steposvetlana [31]

Answer:

10 m/s

Explanation:

Momentum before collision = momentum after collision

m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂

(8 kg)(8 m/s) + (6 kg)(6 m/s) = (8 kg)(5 m/s) + (6 kg) v

64 kg m/s + 36 kg m/s = 40 kg m/s + (6 kg) v

60 kg m/s = (6 kg) v

v = 10 m/s

3 0

4 years ago

What is the direction of propagation of the wave if E⃗ =Ei^,B⃗ =−Bj^. Express the direction of the propagation vector, P⃗ , as a

nataly862011 [7]

Answer with Explanation:

We are given that

Electric field vector= $\vec{E}=E\hat{i}$

Magnetic field vector= $\vec{B}=-B\hat{j}$

We have to find the direction of propagation of the wave.

We know that

The direction of propagation of wave= $\vec{E}\times \vec{B}$

The direction of propagation of wave= $\hat{i}\times (-\hat{j})=-\hat{k}$

Because ( $\hat{i}\times \hat{j}=\hat{k}$ )

The wave propagate in -z direction.

Therefore, the component of the vector is (0,0,-1).

Hence, the direction of the propagation of wave is - z direction and component of direction of propagation vector is (0,0,-1).

6 0

4 years ago

What is a good way to study guys for a science test Im in need because I have a quiz tmrw

nikklg [1K]

Answer:

Space out your studying. Nate Kornell “definitely did cram” before big tests when he was a student. ...

Practice, practice, practice! ...

Don't just reread books and notes. ...

Test yourself. ...

Mistakes are okay — as long as you learn from them. ...

Mix it up. ...

Use pictures. ...

Find examples.

Explanation:

5 0

3 years ago

First sign of lung cancer

quester [9]

the most common first sign of lung cancer is a constant cough. there could also be coughing up blood or reddish colored spit, and chest pain when you laugh, cough, and breathe.

5 0

3 years ago

Read 2 more answers

An incandescent bulb is supplied with

Serga [27]

Answer:

Efficiency = 5%

Explanation:

Given that,

Supplies energy to the bulb = 100 J

Transferred energy by the bulb = 5 J

We need to find the efficiency of the bulb. It can be given by "

$\eta=\dfrac{\text{useful energy out}}{\text{useful energy in}}\times 100\\\\=\dfrac{5}{100}\times 100\\\\=5\%$

So, the efficiency of the bulb is 5%.

8 0

3 years ago