1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Ann [662]
3 years ago
12

Which one of the following accurately describes the force of gravity?

Physics
1 answer:
Aloiza [94]3 years ago
4 0
B. The gravity acceleration is in the same direction as the force of gravity, and thus towards the centre of the earth

You might be interested in
IP The x and y components of a vector r⃗ are rx = 16 m and ry = -8.5 m , respectively
fiasKO [112]

as it is given that

r_x = 16 m

r_y = -8.5 m

now we will have

\vec r = 16 \hat i - 8.5 \hat j

now the magnitude of this vector is given as

|r| = \sqrt{16^2 + 8.5^2}

|r| = 18 m

now to find the direction we can use

tan\theta = \frac{r_y}{r_x}

tan\theta = \frac{-8.5}{16}

\theta = tan^{-1}(-0.53)

\theta = - 28^0

4 0
3 years ago
This chart lists four examples of two objects that are in contact.
Oxana [17]

Before coming into conclusion first we have to understand the direction of heat flow.

Heat is the transferred thermal energy from one body to another body due to the temperature difference just like water flows from higher level to lower level.

Whenever two bodies having different temperature come closer to each other heat will flow from hotter body to cooler one if no external work is done. The heat flow may be through any of the ways i.e conduction,radiation or convection. Hence temperature difference is the parameter which gives the direction of heat flow.

The temperature is also considered as a measure of average kinetic energy of the substance.The thermal energy does not give the direction heat flow. Heat may  flow from the body  having low thermal energy but at higher temperature to the body having higher thermal energy but at low temperature. The reverse does not happen naturally .

In example 1 there is fire and air. Obviously fire is at high temperature and air at low temperature.So heat will flow from object 1 to object 2.

In example 2 there is a metal at 80 degree Celsius and another metal at 12 degree Celsius .So heat will flow from object 1 to object 2

In example 3 we have cooler ocean and warm air. So the heat will flow from object 2 to object 1.

In example 4 we have a tool with high thermal energy and a material with little thermal energy.We already know that thermal energy can not determine the direction of heat flow. Here the temperature of each substance is not given.The kinetic energy is  part of thermal energy.So there is the chance of higher kinetic energy of the tool for having higher thermal energy .At that time the heat will flow object 1 to object 2.Otherwise the reverse will occur. So it is a special case.

As per the question only option 4 is correct which tells that heat will flow from object 1 to object 2 in examples 1,2,4, and heat will flow from object 2 to 1 in example 3. Other options violate the fundamental law of thermodynamics.


7 0
3 years ago
Maria throws two stones from the top edge of a building with a speed of 20 m/s. She throws one straight down and the other strai
Georgia [21]

Maria throws two stones from the top edge of a building at a speed of 20 m/s, The time is mathematically given as

t=4.5 sec.

<h3>How much later is it before the second stone hits?</h3>

Generally, the equation for speed  is mathematically given as

V = u+at

Therefore

0 = 22-9.8xt.

t = 22 /9.8 sec

t = 2.24489.

The same time will be taken from max^m height to point O

The extra time is taken

t=4.49 sec.

t=4.5 sec.

Read more about Time

brainly.com/question/4931057

#SPJ1

7 0
1 year ago
Determine the distribution of charges on the sphere if it is made of non-conducting plastic.
Elden [556K]

Answer:

If the sphere is made of a non-conducting material, charges can´t distribute freely over its surface or volume. In non-conducting material bodies, charges can be transported from a molecule to another nearest to it. Therefore if you rub an object with a positive charge with this sphere made of non-conducting plastic, the object will rip some negative charges (electrons) of that zone of the sphere. Therefore that zone will get a superficial positive charge density, but the non-affected zone of the sphere will keep having a null charge density.

7 0
3 years ago
A certain elastic conducting material is stretched into a circular loop of 1.6 cm radius. It is placed with its plane perpendicu
inysia [295]

Answer:

Induced emf in the loop is 0.0603 volts.

Explanation:

It is given that,

Radius of the circular loop, r = 1.6 cm = 0.016 m

Magnetic field, B = 0.8 T

When released, the radius of the loop starts to shrink at an instantaneous rate of 75.0 cm/s, \dfrac{dr}{dt}=75\ cm/s=0.75\ m/s

We need to find the magnitude of induced emf at that instant. Induced emf is given by :

\epsilon=\dfrac{-d\phi}{dt}

Where

\phi is the magnetic flux, \phi=B\times A

\epsilon=\dfrac{-d(BA)}{dt}, A is the area of cross section

\epsilon=-\dfrac{-d(B(\pi r^2))}{dt}

\epsilon=-2\pi r B(\dfrac{dr}{dt})

\epsilon=-2\pi \times 0.016\times 0.8 \times 0.75\ m/s

\epsilon=0.0603\ V

So, the induced emf in the loop is 0.0603 volts. Hence, this is the required solution.

3 0
3 years ago
Other questions:
  • what is the resistance of a 12m long wire having radius( 2*10 to the power - 4) and resistivity (3.14*10 to the power - 8)ohmM
    7·1 answer
  • What is the total displacement of a dog that runs north 80 meters to chase a ball, returns to its master, and then runs south 20
    14·2 answers
  • What is a good example for newton's 1st law​
    7·2 answers
  • Does anyone understand circuits?
    7·1 answer
  • It is your parent's 25th Wedding Anniversary and you thought it would be special to throw them a surprise party. Your entire fam
    12·1 answer
  • How many times farther is Proxima Centauri from the sun than is earth from the sun
    15·2 answers
  • If a car is rounding a flat curve on a highway, what is the centripetal force on the car?
    12·1 answer
  • Demarcus launches a small weight into the air. The weight takes 6.4 seconds to reach the ground again. At what time did the weig
    15·1 answer
  • Can someone help me w this ?
    6·1 answer
  • Heart cells must contract simultaneously to move blood.
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!