All categories

3 years ago

An IGCSE student thinks it may be possible to identify different rocks (A, B and C) by measuring their

Physics

1 answer:

kherson [118]3 years ago

8 0

Answer:

See the answer below

Explanation:

a. The volume in the first measuring cylinder reads 70 $cm^3$ while that of the second reads 95 $cm^3$ . Hence;

V1 = 70 $cm^3$

V2 = 95 $cm^3$

b. <u>An object will always displace its own volume in a liquid</u>. Hence:

Volume V of the rock sample = V2 - V1

= 95 - 70 = 25 $cm^3$

c. Mass of A = 102 g

Volume of A = 25 $cm^3$

<em>Density = mass/volume</em>

Hence, density of A = 102/25 = 4.08 g/ $cm^3$

You might be interested in

What is one use for infrared waves? A radar B Medical imaging C Thermal imaging cameras

Vilka [71]

Answer:

Im answering for free points sry

Explanation:

...

7 0

3 years ago

Relative to the ground, a car has a velocity of 15.3 m/s, directed due north. Relative to this car, a truck has a velocity of 22

bogdanovich [222]

Answer:

The magnitude of the truck's velocity relative to the ground is 35.82 m/s.

Explanation:

Given that,

Velocity of car relative to ground = 15.3 m/s

Velocity of truck relative to car = 22.5 m/s

We need to calculate the magnitude of the truck's velocity relative to the ground

We need to calculate the x component of the velocity

$v_{x}=22.5\cos\theta$

$v_{x}=22.5\cos52^{\circ}$

$v_{x}=13.852\ m/s$

We need to calculate the y component of the velocity

$v_{y}=15.3+22.5\sin\theta$

$v_{y}=15.3+22.5\sin52^{\circ}$

$v_{y}=33.030\ m/s$

Using Pythagorean theorem

$|v|=\sqrt{v_{x}^2+v_{y}^2}$

$|v|=\sqrt{(13.852)^2+(33.030)^2}$

$|v|=35.82\ m/s$

Hence, The magnitude of the truck's velocity relative to the ground is 35.82 m/s.

5 0

3 years ago

a baseball is thrown vertically upwards and returns to the thrower three seconds later find speed at which the ball us thrown

rodikova [14]

Answer:

14.7 m/s

Explanation:

Since the motion of the ball is a uniformly accelerated motion, we can find the initial speed by using the following suvat equation:

$s=ut+\frac{1}{2}at^2$

where

s is the vertical displacement

u is the initial velocity

t is the time

a is the acceleration

In this problem, we have:

s = 0 (because at the end of the motion, the ball returns to its original position)

u = ?

$a=g=-9.8 m/s^2$ is the acceleration of gravity (negative because it is downward)

$t = 3 s$ is the total time of flight

Solving for u, we find the initial velocity of the ball:

$0=ut+\frac{1}{2}at^2\\u=-\frac{1}{2}at=-\frac{1}{2}(-9.8)(3)=14.7 m/s$

4 0

4 years ago

A thermosensory neuron in the skin converts heat energy to nerve impulses via a conversion called

Sav [38]

Answer:

Sensory transduction

Explanation:

The term sensory transduction refers to the conversion process where the sensory energy is converted in order to change the potential of a membrane.

In other words, it can defined as the process of energy conversion such that stimulus can be transmitted or received by the sensory receptors and the nervous system may initiate with the sensory receptors.

Transduction takes in all of the five receptors of the body. Thus skin is also one of the receptors and hence conversion of heat energy into impulses takes place with the help of thermo-sensory neuron.

3 0

3 years ago

A researcher wants to know the effect of lighting on snacking behavior. He knows that young adults normally eat an average of =

horrorfan [7]

Answer:

It does not impact snacking behavior.

Explanation:

The mean of the study was 18.7 grams, which is only 2.3 grams below the actual average grams of snacks that an adult would consume while at work, after revising this you could say that theres a significant reduction, but then the standard deviation is 9.1 this means that there are still adults that are eating more than 21 gram of snacks, so the test would result inconclusive.

8 0

4 years ago