Explain why the thermometer has thin walls on its bulb?

1 answer:

7 0

The glass around the bulb in a clinical thermometer (the conventional one) is <span>thin because glass is not a good conductor of heat. The clinician and the
</span>patient don't want to wait half an hour to get a good temperature reading. By <span>using the thinner glass, the transfer of heat into the thermometer's fluid will</span>

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A dart gun shoots a dart with an angle of 45' above horizontal During the upward part of the trajectory the gravitational accele

ludmilkaskok [199]

Answer:

4. Downward and its value is constant

Explanation:

As this is a case of projectile motion, we use the reference frame where upward direction to be positive for $y$ , and in the same way to be negative in the downward direction. On another hand, we have that gravity is always acting this means that gravitational acceleration g is directed downward constantly over the dart not only during the upward but also during the downward part of the trajectory. And it is ruled by the following equations.

For the x-axis

$v_{x}=v_{0}cos(45\°)=constant$

$x=(v_{0}cos(45\°))t$

For the y-axis

$v_{y}=v_{0}sin(45\°)-gt$

$y=v_{0}sin(45\°)t-\frac{1}{2} gt^{2}$

Where $v_{0}$ , is the initial velocity.

8 0

3 years ago

If the velocity of a body changes from 13 m/s to 30 m/s while undergoing constant acceleration, what's the average velocity of t

vesna_86 [32]

Average velocity is found by the following formula:

$v_{average} = \frac{v_f+v_i}{2}$

$v_i = 13 \\ v_f = 30 \\ v_{average} = \frac{30+13}{2} = \frac{43}{2} = 21.5 \frac{m}{s}$

3 0

3 years ago

Read 2 more answers

A 3500 kg truck is parked on a 7.0∘ slope. How big is the friction force on the truck?

Arada [10]

Answer:

4180 N

Explanation:

In order to keep the truck balanced and stationary, the force of friction on the truck must be equal to the component of the weight of the truck acting parallel to the slope.

The component of the weight of the truck acting parallel to the slope is:

$mg sin \theta$