Answer:
2.74 N-s
Explanation:
m = mass of the basketball thrown towards the floor = 0.60 kg
v₀ = initial speed of the ball before hitting the floor = 5.4 m/s
θ = angle made by the direction of motion of the ball with the vertical before and after the collision = 65°
I = Impulse delivered to it by the floor
Impulse delivered to the ball by the floor is given as
I = 2 m v₀ Cosθ
Inserting the values
I = 2 (0.60) (5.4) Cos65
I = 2.74 N-s
Both hemispheres are warmer in their Spring than they are
in their Winter, because . . .
A). the sun climbs higher in the sky during Spring than it does during
WInter ... shooting its rays more directly at the ground ...,
and
B). the sun stays up in the sky longer in Spring than it does in
Winter, giving the ground more time to absorb its rays.
Answer:
There are finally 4 rotations per second.
Explanation:
If a trapeze artist rotates once each second while sailing through the air, and contracts to reduce her rotational inertia to one fourth of what it was. We need to find the final angular velocity. It is a case of conservation of angular momentum such that :
Let 
, 
and 
So,
So, there are finally 4 rotations per second. Hence, this is the required solution.
The overall charge on a neutral atom is zero.
A neutral atoms contains equal number of electrons and protons.The charge of a proton and electron is equal in magnitude but opposite in sign. A proton has a charge of 1.6 x 10⁻¹⁹C and the charge of an electron is -1.6 x 10⁻¹⁹C. Thus in a neutral atom, the charge of all the protons gets cancelled with the charge of all the electrons.
Thus a neutral atom has a net zero charge.
1) How are particles in motion and temperature related?
Temperature is the measure of heat. The kinetic energy of particles in motion is determined by the temperature. The higher the temperature, the higher the kinetic energy of the particles (basically, the hotter it is the faster the particles move).
2) How does a thermometer work?
A thermometer measures the average kinetic energy of the particles around the thermometer. As seen in 1), the kinetic energy defines the temperature, so measuring the energy of the particles can show you the temperature of the object.
3) What are temperature scales, list them and give examples.
Temperature scales are pretty much systems with which we compare different temperatures. The three widely used temperature scales today are Fahrenheit, Celsius, and Kelvin. All three are used in different countries and mainly for different purposes. Fahrenheit is used only in the United States and a few other countries around the world, while Celsius is excepted by nearly the entire rest of the world. Kelvin is used primarily in the scientific setting.
4) Define volume.
Volume is pretty much the amount of three-dimensional space an object or substance takes up. For example, a liter is a unit of measurement of volume. A two-liter bottle of soda means it contains the amount of soda that fills up 2-liters worth of three-dimensional space.
I hope this helped.
