Question

A car is traveling at a constant velocity of 60 km/h for 4 hours.
Choose the correct statement about the acceleration of the car.


A)
The acceleration of this car is zero.


B)
The acceleration of this car is positive.


C)
The acceleration of this car is negative.


D)
The acceleration of this car is 15
m
s
.

Answer 1

Do you know the definition of acceleration ?

Answer 2

Basically, acceleration represents the rate of change of speed or "how much speed changes" for whatever object and duration you are studying.

Answer 3

Honestly yes of course but see i have 10 mintues to finish this science work and im trying to get it done as fast i can before its to late.

Answer 4

Alright lol it's A).

Answer 5

If your speed is constant, acceleration is zero.

Answer 6

Thank you so much for understanding!

Answer 7

James and Juan were at the highest point in the football stadium, dropping water balloons on people below. Many of the balloons did not break, so the boys added more water to the balloons.

What impact did adding water have on the balloons' potential energy?


A)
It had no impact; it just made the balloons bigger.


B)
The gravitational potential energy increased because the mass increased.


C)
The gravitational potential energy decreased because the diameter increased.


D)
The gravitational potential energy remained constant because they did not increase the height.

Answer 8

Potential energy is expressed as the product of mass, gravitational acceleration and height (from the ground). By adding more water they increased the mass of the baloons and therefore the potential energy as well.

Answer 9

So B)

Answer 10

Alrighty! thank you so much

Answer 11

Considering the factors that affect gravitational pull, in which location would the gravitational pull from the earth be SMALLEST on you?


A)
visiting friends at the beach


B)
visiting Santa on the second floor of the mall


C)
visiting Uncle Chrissy in the Himalayan Mountains


D)
visiting cousin Snelfu in his submarine at the bottom of the ocean

Answer 12

Ask away if there's anything more.

Answer 13

Your okay with it? :) Thanks!

Answer 14

Gravitational pull decreases as you distance yourself from the Earth's center of mass / core. Answer would be C) since those are some the highest mountains in the world.

Answer 15

I like this.

Answer 16

Thank you again!

Answer 17

During chemistry lab, Mrs. Black’s students placed an antacid tablet in a zip lock bag. They recorded the mass of the tablet in the bag. Then they carefully added 50 grams of water and quickly sealed the bag. The tablet began to fizz and soon disappeared. The bag was filled with gas and it felt cold to the touch.
What type of change occurred in the bag and how can you support your answer?


A)
It is a physical change because the tablet dissolved.


B)
It is a physical change as evidenced by change in temperature.


C)
It is a chemical change due to the change in temperature and gas production.


D)
It is a chemical change because the tablet dissolved and the temperature of the liquid dropped.

Answer 18

Not exactly sure on this one. It is a thermodynamic change since what happened there was an isocore transformation (change of pressure and temperature at constant volume). I'd say B) but I'm not sure.

Answer 19

Okay its no problem!

Answer 20

Definitions are not my thing. It's both a chemical and a physical change but I don't really know / care what the teacher wants to hear.