TRUE or FALSE. According to universal gravitation, both mass and air resistance affect the gravitational attraction between objects.
Answers
Gravitational force is independent of medium and depends only on the masses of the two objects and the distance between them.
Related Questions
What is the potential energy of a 2-kilogram potted plant that is on a 1 meter-high plant stand?
In which of the following methods of heat transfer is it necessary for the objects to be directly touching one another? A. convection. B. radiation. C. conduction. D. all of these.
Why current remains same in series combination of resistors in all resistors and p.d. remains different?
50 J of work was performed in 20 seconds. how much power was used to do this task?
- 30
- 45
- 450
Answers
Answer:
45 easy and if u ever need anything holla
Answers
Wow ! This is not simple. At first, it looks like there's not enough information, because we don't know the mass of the cars. But I"m pretty sure it turns out that we don't need to know it.
At the top of the first hill, the car's potential energy is
PE = (mass) x (gravity) x (height) .
At the bottom, the car's kinetic energy is
KE = (1/2) (mass) (speed²) .
You said that the car's speed is 70 m/s at the bottom of the hill,
and you also said that 10% of the energy will be lost on the way
down. So now, here comes the big jump. Put a comment under
my answer if you don't see where I got this equation:
KE = 0.9 PE
(1/2) (mass) (70 m/s)² = (0.9) (mass) (gravity) (height)
Divide each side by (mass):
(0.5) (4900 m²/s²) = (0.9) (9.8 m/s²) (height)
(There goes the mass. As long as the whole thing is 90% efficient,
the solution will be the same for any number of cars, loaded with
any number of passengers.)
Divide each side by (0.9):
(0.5/0.9) (4900 m²/s²) = (9.8 m/s²) (height)
Divide each side by (9.8 m/s²):
Height = (5/9)(4900 m²/s²) / (9.8 m/s²)
= (5 x 4900 m²/s²) / (9 x 9.8 m/s²)
= (24,500 / 88.2) (m²/s²) / (m/s²)
= 277-7/9 meters
(about 911 feet)
Answers
D is the correct answer.
Final answer:
Heat transfer between two objects happens when energy transfers from the hotter object to the colder object until they reach thermal equilibrium. This can happen through conduction, convection, and radiation.
Explanation:
The transfer of heat between two objects is best explained by the principle that energy is transferred from the hotter object to the colder object, and this occurs until both objects have reached the same temperature. This transfer of heat energy happens primarily through three processes known as conduction, convection, and radiation.
Conduction is the transfer of heat between two objects in direct contact with each other, such as a hot pan warming up food. Convection is the transfer of heat due to the movement of mass, typically within fluids like air or water. Radiation is the transfer of heat through electromagnetic waves, like the heat you feel from the Sun on a sunny day.
When two objects of different temperatures come into contact, like object X with temperature Tx and object Y with temperature Ty, heat flows spontaneously from the hotter object X to the colder object Y. This results in a loss of thermal energy in X and a gain in thermal energy in Y, until both reach a state of thermal equilibrium.
Learn more about Heat Transfer here:
#SPJ2
Answers
Answer:When a sphere rolls down an inclined plane without slipping, its linear acceleration at the bottom can be calculated using the following formula:
a = g * sin(theta)
where "a" is the linear acceleration, "g" is the acceleration due to gravity (approximately 9.8 m/s^2), and "theta" is the angle of inclination of the plane.
Let's break down the formula step by step:
1. First, we need to determine the component of the gravitational force that acts parallel to the inclined plane. This component is given by g * sin(theta), where "g" is the acceleration due to gravity and "theta" is the angle of inclination.
2. Since the sphere is rolling without slipping, the frictional force between the sphere and the inclined plane is responsible for its linear acceleration. This frictional force is equal to the component of the gravitational force parallel to the plane.
3. Therefore, the linear acceleration of the sphere as it reaches the bottom of the inclined plane is equal to the component of the gravitational force parallel to the plane, which is g * sin(theta).
For example, if the angle of inclination, theta, is 30 degrees, the linear acceleration of the sphere at the bottom of the inclined plane would be:
a = g * sin(30) = 9.8 m/s^2 * 0.5 = 4.9 m/s^2
So, the linear acceleration of the sphere as it reaches the bottom of the inclined plane would be 4.9 m/s^2 when the angle of inclination is 30 degrees.
Explanation:
a.0.14 kg
b.0.37 kg
c.11.9 kg
d.21.82 kg
Answers
Answer:
a)0,14 kg
Explanation:
Formula to calculate the gravitational potential energy:
U= m *g*h : equation (1)
U: It's gravitational potential energy in Joules (J)
m: body mass in kilograms (kg)
g= the acceleration of gravity ()
h= the body heigt measured from the floor (m)
Known information:
U= 116.62 J
g = 9.8
h =85m
mass calculation:
We replace the known information in equation 1 :
116.62 = m*9.8*85
m =116.62/(9.8*85)
m= 0,14 kg
The mass of the ball is 0,14 kg
PE = mgh
116.62 = m•(9.8)•(85)
m = 116.62/(9.8•85)
= 0.14 kg
b) gram (used to measure mass)
c) cubic centimeter (used to measure volume)
Answers
Answer:
Option (c)
Explanation:
The combination of two or more fundamental units is called derived unit. For example, cubic metre, newton per metre, metre per second.
Thus, cubic centimetre is a derived unit.