Airbags will deploy in a head-on collision, but not in a collision that occurs from an angle.

A student weighing 500. newtons

Romashka [77]

Answer:

The elevator must be <u>accelerating upward</u> as the net force acting is upward.

Explanation:

Given:

Original weight of the student, $W=500\ N$

Reading on the spring scale is the normal reaction by the scale on the student and is given as, $N=520\ N$

The normal reaction acts in the upward direction while the weight of the student acts vertically downward.

Now, the magnitude of the normal reaction is greater than the magnitude of the weight. Therefore, the net force acting on the student is given as:

$F_{net}=N-W\\F_{net}=520-500=20\ N(\textrm{Vertically upward})$

Therefore, the net force is acting vertically upward.

Now, as per Newton's second law, the direction of the net acceleration acting on a body is the same as the direction of the net force acting on it.

Thus, the elevator must be accelerating upward as the net force acting is upward.

6 0

4 years ago

What relationship do you see between a star colour and temperature

Andrei [34K]

Answer:

Stars emit colors of many different wavelengths, but the wavelength of light where a star's emission is concentrated is related to the star's temperature - the hotter the star, the more blue it is; the cooler the star, the more red it is

5 0

3 years ago

To a motorist travelling due North at 50km/hr, the wind appears to come from North West at 60mk/hr. Find the true velocity of th

kvv77 [185]

Answer:

The true velocity of wind will be 43.1 km/h.

Explanation:

Given that,

Velocity of motor $\vec{v_{m}}= 50\hat{j}\ km/h$

The resultant velocity of wind

$\ver{v_{r}}=60\hat{i}\times\dfrac{1}{\sqrt{2}}+60\hat{j}}\times\dfrac{1}{\sqrt{2}}$

Suppose, the true velocity of wind is $\vec{v_{w}}$ .

We need to calculate the true velocity of wind

Using formula of resultant velocity

$\vec{v_{m}}+\vec{v_{w}}=\vec{v_{r}}$

$\vec{v_{w}}=\vec{v_{r}}-\vec{v_{m}}$

Where, $\vec{v_{m}}$ = velocity of motor

$\vec{v_{w}}$ = velocity of wind

$\vec{v_{r}}$ = resultant velocity

Put the value into the formula

$\vec{v_{w}}=\dfrac{60}{\sqrt{2}}\hat{i}+(\dfrac{60}{\sqrt{2}}-50)\hat{j}$

$\vec{v_{w}}=42.43\hat{i}-7.57\hat{j}$

The magnitude of true velocity is,

$v_{m}=\sqrt{(42.43)^2+(-7.57)^2}$

$v_{m}=43.0.9\approx 43.1\ km/h$

Hence, The true velocity of wind will be 43.1 km/h.

7 0

3 years ago

Which are consequences of smoking while pregnant

inn [45]

Answer:

Explanation:

Tobacco. Smoking during pregnancy increases the risk of health problems for developing babies, including preterm birth, low birth weight, and birth defects of the mouth and lip. Smoking during and after pregnancy also increases the risk of sudden infant death syndrome (SIDS).

6 0

3 years ago

A portable television using a 12 volt, 3 Ah rechargeable battery can operate for a period of about 6 hours. What is the average

bezimeni [28]

Answer:

0.5 A

Explanation:

Current: This is defined as the rate flow of electric charge round a circuit,

The S.I unit of current is Ampere (A). Mathematically,

Current (I) = C/t

I = C/t................ Equation 1

Where C = capacity of the battery, t = time

Given: C= 3 Ah, t = 6 hours.

Substitute into equation 1

I = 3/6

I = 1/2

I = 0.5 A.

Hence the average current drawn = 0.5 A

7 0

3 years ago