False: the force of gravity acting on different objects is different and depends on their mass
Explanation:
The answer is false.
The force of gravity acting on an object (also known as weight) near the Earth's surface is given by:
![F=mg](https://tex.z-dn.net/?f=F%3Dmg)
where:
m is the mass of the object
is the acceleration of gravity
We see from the formula that the force of gravity acting on an object depends on the mass: the larger the mass of the object, the stronger the gravitational force acting on it, and the smaller the mass, the weaker the force of gravity.
The factor that does not change is the acceleration of gravity, which is constant (
) if we are near the Earth's surface, and implies that all the objects in free fall accelerate at the same rate towards the ground, regardless of their size and weight.
Learn more about forces and weight here:
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Assuming the driver starts slamming the brakes immediately, the car moves by uniformly decelerated motion, so we can use the following relationship
![2aS = v_f^2 - v_i^2](https://tex.z-dn.net/?f=2aS%20%3D%20v_f%5E2%20-%20v_i%5E2)
(1)
where
a is the deleceration
S is the distance covered after a time t
![v_f](https://tex.z-dn.net/?f=v_f)
is the velocity at time t
![v_i=100 km/h = 27.8 m/s](https://tex.z-dn.net/?f=v_i%3D100%20km%2Fh%20%3D%2027.8%20m%2Fs)
is the initial speed of the car
The accident is 80 m ahead of the car, so the minimum deceleration required to avoid the accident is the value of a such that S=80 m and
![v_f=0](https://tex.z-dn.net/?f=v_f%3D0)
(the car should stop exactly at S=80 m to avoid the accident). Using these data, we can solve the equation (1) to find a:
![a=- \frac{v_i^2}{2 S}= -\frac{(27.8 m/s)^2}{2 \cdot 80 m} =-4.83 m/s^2](https://tex.z-dn.net/?f=a%3D-%20%5Cfrac%7Bv_i%5E2%7D%7B2%20S%7D%3D%20-%5Cfrac%7B%2827.8%20m%2Fs%29%5E2%7D%7B2%20%5Ccdot%2080%20m%7D%20%3D-4.83%20m%2Fs%5E2%20)
And the negative sign means it is a deceleration.
Answer:All of the elements in a period have the same number of atomic orbitals. For example, every element in the top row (the first period) has one orbital for its electrons. All of the elements in the second row (the second period) have two orbitals for their electrons.Explanation:
The water. Take the specific heat of steel, estimate the volume of the nail, you know the volume of the water, which has a specific heat of one. Or be obvious. If you dropped a red hot nail into a liter of cold water, what would happen?
Answer:
Water