Answer:
Option d and e are correct.
Explanation:
The expression for velocity of pulse in a stretched string can be given as follows
v = 
where T is tension in the string , m is mass of string per unit length.
Use of lighter string of the same length, under the same tension amounts to higher m so velocity will decrease. Hence option d is correct.
Similarly, v is directly proportional to square root of tension. So if we increase tension , velocity also increases. So option e ) is correct.
Answer: Microwaves.
Explanation: First, we have a trivial answer, and that is the visible light, which is responsible to let the information on the tv to be seen by the user.
Now, TV technology was possible thanks to the microwaves, that are used because these can carry more energy than other types, and these microwaves needed a special technology because they couldn't be handled by the current technology at the time.
Answer:
Rocket 2 has highest acceleration.
Explanation:
Net force,
F = mass (m) × acceleration (a)
We have,
m₁ = 4.25 kg and F = 120 N
m₂ = 3.25 kg, F₂ = 120 N
m₃ = 5.5 kg, F₃ = 120 N
m₄ = 4.5 kg, F₄ = 120 N
Hence, it can be seen that the highest acceleration is of rocket 2.
Answer: wave
Explanation:
These are the basic definitions and characteristic of the terms given, which show tha the only rigth answer is the second option: wave.
1) Force is an interaction. There are four natural forces: electrostatic, gravity, strong nuclear force and weak nuclear force.
2) Wave: is a sequence of pulses or vibrations that cause the continuous transportation of energy (propagation). There is not transport of mass, only energy.
Some examples of waves are sound waves, electromagnetic waves (light, radio waves, micro waves, infrarred waves, ultraviolet waves).
3) Vacuum: is the absence of matter; empty space. Only electromagnetic waves can travel through vacuum; other waves need a medium to travel.
4) Medium: any matter is a medium: a solid, the air, a liquid, all of them are media through which waves can transport its energy, depending of the wavelength.
Answer:
F= = 3.18 * 10^3 N
Explanation:
information given:
m= 40.5 kg
a= seven times gravity so we have
a= 7 g
where
gravity = g =9.8 m/s2
F= m*a
F= (40.5) * 7g
a = 7 g = (7) (9.8) = 68.6 m/s2
There are two forces acts on gymnsat
Where ,w is the weight of Gymnsat
F(net) = F - mg
F- mg = ma
F = mg+ma
so
F= m ( g + a)
F = (40.5) [9.8+ 68.6 ]
F = 3.18 * 10^3 N
