one car travels east for 360 m over a period of 15 seconds. a second car travels west for 120 m over a period of 5 seconds. what is true about their speeds? their velocities?

Answers

Answer 1

Answer: Take it one step at a time.

-- Remember that 'speed' means (distance) divided by (time),
and the direction doesn't matter.

-- Remember that 'velocity' means the speed and the direction.

First car:
360 meters east in 15 sec.
Speed = 360/15 = 24 meters per second
Velocity = 24 meters per second east

Second car:
120 meters west in 5 seconds
Speed = 120/5 = 24 meters per second
Velocity = 24 meters per second west

-- Their speeds (24 and 24) are equal.

-- Their velocities are equal magnitude but opposite (24 east / 24 west).

Answer 2

Answer: it's the same because when you divide you can see they have the same velocity

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The charges on two metallic balls are 5.0 and 7.0 coulombs respectively. They are kept 1.2 meters apart. What is the force of interaction between the two?

Answers

Answer: the correct answer is 8*10^-11

The freezing point of water is the same as its a. melting point. b. boiling point. c. sublimation point. d. evaporation point.

Answers

Answer: melting point.

Explanation:

Freezing point is the temperature at which liquid phase changes to solid phase. Freezing point of water is $0^0C$ .

$H_2O(l)\rightarrow H_2O(s)$

Melting point is the temperature at which solid phase changes to liquid phase. Melting point of water is $0^0C$ .

$H_2O(s)\rightarrow H_2O(l)$

Melting and freezing are reversible processes which takes place at $0^0C$ for water.

Boiling point is the temperature at which vapor pressure of the liquid becomes equal to atmospheric pressure.

Sublimation point is the temperature at which gaseous phase changes to solid phase.

Thus the freezing point of water is the same as its melting point.

The freezing point of water is the same as its melting point. (option a)

The freezing point of a substance refers to the temperature at which it changes from a liquid state to a solid state. In the case of water, this is when it turns from liquid water into ice. It's crucial to note that the freezing point of a substance is the same as its melting point, which is the temperature at which the solid changes back into a liquid. So, the answer is option a. The freezing point of water is the same as its melting point.

Hence the correct option is (a).

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T or f Halogens are the basis of all fossil fuels.

Answers

The statement about “Halogens are the basis of all fossil fuels.” is false. It is the carbon that is the basis of all fossil fuels.

Which scientist first made a model of the atom called the plum pudding model?John Dalton
J.J. Thomson
Ernest Rutherford
Neils Bohr

Answers

The plum pudding model of theatom by the scientist Sir Joseph John Thompson or J.J. Thompson. It wastheorized after the discovery that electrons are present in the atom. In thismodel, the atom is composed mainly of electrons. It was describe as plum puddingbecause the electrons are dispersed within the atom. John Dalton discovered theatom. Ernest Rutherford discovered the half – life of an atom and Neils Bohrexplain the quantum mechanics. So the answer is J.J. Thompson.

a transformer with a turns ratio (secondary/primary) of 1:10 is used to step down the voltage from a 120-v wall socket to be used in a battery recharging unit. What is the voltage supplied to the recharger?

Answers

The voltage ratio of a transformer is nominally equal to the turns ratio.

If you connect 120 volts AC to one side of the 1:10 transformer, you'll
get 12 volts out of the other side if you connected it up the correct way,
or 1200 volts if you connected things up backwards.

Note that it has to be AC. If the input to a transformer is DC, then the
output is always smoke.

Answer:

the answer on edge is 48

Explanation:

a block of mass 5kg slides down an inclined plane that has an angle of 10 degrees if the inclined plane has no friction and the block starts at a height of 0.8m how much kinetic energy does the block have when it reaches the bottom? acceleration due to gravity is 9.8m/s2. someone help me how to solve this, physics conservation of energy

Answers

The physics conservation of energy E = 39.2 joules.

To calculate the Physics conservation of energy.

Mass of the block, m = 5 kg

At the top, the block will have only potential energy which is given by :

P=mgh

At the bottom of the inclined plane, it will have only kinetic energy which is given by :

E=(1/2)mv2

Applying the conservation of energy as :

E=(1/2)mv2=mgh

E=5*9.8*0.8

E = 39.2 joules.

The physics conservation of energy E = 39.2 joules.

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In this case, the inclined plane is frictionless and therefore energy is perfectly conserved with no losses. The block originally starts off with some gravitational potential energy, which is then completely converted into kinetic energy. So the initial gravitational potential energy is equal to the final kinetic energy.

$PE_(initial) = KE_(final)$
$PE_(initial) =mgh=(5kg)(9.8m/ s^(2) )(0.8m)=39.2 joules$
$KE_(final)=39.2joules$

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