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
KatRina [158]
3 years ago
5

You push really hard against a round rock, but you cannot make it roll. Which statement best explains why you cannot move the ro

ck
Physics
1 answer:
cluponka [151]3 years ago
8 0

Answer:

b

Explanation:

a Gravity pulls the rock toward the center of Earth.

b The forces between you and the rock are balanced.

c The force of your push is greater than the opposing force.

d There is no friction to help you move the object.

The correct answer would be that <u>the forces between you and the rock are balanced.</u>

<em>In order to get the rock rolling, both the frictional force between the rock and the surface on which it stands as well as the gravitational force acting on its mass must be exceeded. If the applied force balances these forces or falls short, the rock will not move.</em>

The correct option is b.

You might be interested in
Satellite A is orbiting Earth at an altitude of 500 km and Satellite B is orbiting 800 km above the surface . How does the veloc
sp2606 [1]

The velocity of Satellite A is 2% greater than velocity of satellite B.

The given parameters;

  • <em>Altitude of Satellite A = 500 km</em>
  • <em>Altitude of Satellite B = 800 km</em>

The forces acting on the Satellites are given as follows;

F_c = \frac{mv^2}{r} \\\\F_g = \frac{GMm}{r^2} \\\\\frac{v^2}{r}  = \frac{GM}{r^2}\\\\v^2 = \frac{GM}{r} \\\\v^2 r = GM\\\\v_1^2 r _1 = v_2^2 r_2\\\\v_A^2r_A = v_B^2 r_B\\\\(\frac{v_A}{v_B} )^2 = \frac{r_B}{r_A} \\\\\frac{v_A}{v_B}  = \sqrt{\frac{r_B}{r_A} } \\\\\frac{v_A}{v_B}  = \sqrt{\frac{(800,000\  + \ 6.4 \times 10^6}{(500,000\  + \ 6.4 \times 10^6} )} \\\\\frac{v_A}{v_B}  =  1.02 \\\\v_A = 1.02 \ v_B

v_A = v_B( 100\% \ + 2\%)\\\\v_A = 100\%v_B \ + \ \ 2\% v_B\\\\v_A = v_B \ \ + \ 2\% v_B

Thus, the velocity of Satellite A is 2% greater than velocity of satellite B.

Learn more about velocity of satellite here: brainly.com/question/13981089

4 0
3 years ago
Identify which method of thermal energy transfer would be fastest through a vacuum, which would be fastest through a gas, and wh
Blizzard [7]

Answer:

vacuum-radiation

gas-convection

solid-conduction

Explanation:

6 0
3 years ago
A car travels at uniform acceleration over a tine interval of 20.0s. its initial velocity is 11.0m/s and its final velocity is 3
SIZIF [17.4K]

Since the acceleration is uniform, we can calculate it from the data we are given:

a = (vf - vi)/2

where vf=33 m/s and vi=11 m/s

Then use Suvat's equation:

x(t) = vi*t + 0.5 * a * t

where t=20s

3 0
4 years ago
Find the magnitude of the average induced emf in the coil when the magnet is turned off and the field decreases to 0 T in 2.8 s
Ostrovityanka [42]

Answer:

<em>2.15 mV</em>

<em></em>

Explanation:

The complete question is

You have a coil of wire with 17 turns each of 1.5 cm radius. You place the plane of the coil perpendicular to a 0.50-TB?  field produced by the poles of an electromagnet.

Find the magnitude of the average induced emf in the coil when the magnet is turned off and the field decreases to 0 T in 1.9 s .

Radius of the coil = 1.5 cm = 0.015 m

number of turns = 17

Initial magnetic field B_{1} = 0.50 T

Final magnetic field B_{2} = 0 T

time taken dt = 1.9 s

Area pf the coil = πr^{2} = 3.142 x 0.015^{2} = 7.1 x 10^-4 m^2

magnetic flux = BA

initial flux = B_{1}A = 0.5 x 7.1 x 10^-4 = 3.55 x 10^-4 Wb

Final flux = B_{2}A = 0 x 7.1 x 10^-4 = 0 Wb

change in flux dФ = 3.55 x 10^-4  -  0 = 3.55 x 10^-4 Wb

Induced EMF E = NdФ/dt = (17 x 3.55 x 10^-4)/2.8 = 2.15 x 10^-3 V

==> <em>2.15 mV</em>

7 0
4 years ago
How do convection cells in earths atmosphere cause high- low pressure belts
Elanso [62]
As the air moves away from the poles and along Earth's<span> surface, it begins to warm and the </span>pressure<span> drops. This drop in </span>pressure<span> creates </span>low-pressure
belts<span> around 60° north and 60° south latitude. </span>Convection cells <span>are </span>caused<span> by this rising and sinking of air.</span>
5 0
4 years ago
Other questions:
  • a plant will orbit the sun because the gravitational force of the sun pulls on the plant. The gravitational force of the planet
    5·1 answer
  • In 1985 in San Antonio, Texas, an entire hotel building was moved several
    13·1 answer
  • When a slice of buttered toast is accidentally pushed over the edge of a counter, it rotates as it falls. If the distance to the
    8·1 answer
  • Explain the difference between kingdom and a species
    15·1 answer
  • The pressure of a gas is 15 atm in a 5L cylinder. If the volume of the cylinder is depressed to 3L, What is the new pressure exe
    14·1 answer
  • When does radioactivity decay occur?
    8·1 answer
  • An electric heater works by passing a current of 100 A through a coiled metal wire, making it red hot. If the resistance of the
    11·1 answer
  • A ball is thrown downward from the top of a 31.0 m tower with an initial speed of 10.0 m/s. Assuming negligible air resistance,
    14·1 answer
  • Which formula is used to calculate the mass of an object if the force and acceleration are known?
    11·1 answer
  • Can someone help me with these ​
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!