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Bond [772]
3 years ago
14

Whenever you push an object across a frictional surface, it starts out taking a lot of force to push to get the object moving. H

owever, once the object starts moving, it is much easier to keep it moving. What does this tell you about one of the main differences between static and kinetic friction?
A) Static friction only depends on the surface material, while kinetic friction only depends on the motion
B) Kinetic and Static friction are the exact same thing
C) Static friction and kinetic friction are combined in one at all times, but static friction is just not seen during the motion
D) Static Friction is much stronger than kinetic friction, so it takes more force to get an object moving than it does to keep it moving
Physics
1 answer:
ira [324]3 years ago
4 0

Answer:

The correct answer is D. Static friction is much stronger than kinetic friction, so it takes more force to get an object moving than it does to keep it moving.

Explanation:

We can eliminate choice A if we know that both static friction and kinetic friction depend on what are called the coefficients of static friction and kinetic friction, respectively.  These coefficients are a reflection of the nature of the surface.  In other words, both static friction and kinetic friction depend on the surface material (choice A is incorrect).

Choice B is incorrect because static friction applies to still (static) object whereas kinetic friction applies to moving objects (that have kinetic energy).

Choice C is also incorrect.

Choice D is correct as described in the given information.  It takes much more force to start an object from rest than to keep it moving.  Think about things in your everyday life - it takes a push to get a toy car moving along the ground, but you do not need to consistently push the car with the same force to keep it moving.  This reflects that static friction is much stronger than kinetic friction, which is also described by the relationship between their coefficients (the coefficient of static friction is generally greater than that of kinetic friction).

Hope this helps!

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What capacitor in series with a 100ω resistor and a 24.0 mh inductor will give a resonance frequency of 1040 hz ?
dexar [7]
The resonant frequency of a RLC circuit in series is the frequency at which the inductive reactance and the capacitive reactance are equal:
X_L = X_C 
where:
X_L = 2 \pi f L
X_C =  \frac{1}{2 \pi f C} (1)
where
f is the frequency
L is the inductance 
C is the capacitance

In our circuit, we have the inductance:
L=24.0 mH=0.024 H
and the resonant frequency:
f=1040 Hz
so we can re-arrange eq.(1) to find the capacitance of the circuit:
C= \frac{1}{4 \pi^2 f^2 L}= \frac{1}{4 \pi^2 (1040 Hz)^2 (0.024 H)}=9.8 \cdot 10^{-8} F=98 nF
3 0
3 years ago
Priscilla is driving her car on a busy street and Harvey passes her on his motorcycle. What will happen to the sound from his mo
Marrrta [24]

Answer:

what will happen to the sound is the wavelength increases thus frequency decreases so the sound decreases as he move away from her car..

6 0
3 years ago
An unknown mass is on a flat frictionless surface and a 2 kg object is attached to it with a string going over pulleyt mounted t
Lynna [10]

Answer:

Explanation:

F=ma

F in this case is the gravity acting on the 2kg object. Acceleration of gravity is 9.8 m/s^2. SF=ma, so

F = 2kg*(9.8 m/s^2) = 19.6 N

Now use this force to determine the mass of the object on the table:

F=ma

19.6 N (1N=kg*m/s^2) = m*(1.8 m/s^2)

m = 10.89 kg

3 0
3 years ago
What is matter? explain and give example
kotykmax [81]
Matter is generally any physical substance, and it's all around us... a form of matter would be liquid, and water is a liquid.
4 0
3 years ago
Kevin jump straight up in the air to a height of 1 m at the top of his jump he has the potential energy of 1000 J answer the fol
NeTakaya

Answer:

1000N,4.48m/s

Explanation:

Height(h) = 1m

P. E = 1000J

P. E = mass x acceleration due to gravity x height

Acceleration due to gravity = 10m/s

P. E = mgh

Where weight = mg

P. E = weight x height

Weight = P. E / height

Weight = 1000 / 1

Weight. 1000N

b) as he leaves the ground P. E = K. E

P. E = 1/2 mv2

P. E = 1000 , mass = weight / 10

                      Mass =1000/10 = 100kg

P. E = 1/2 mv2

1000 = 1/2 x 100 x v2

Multiply both sides by 2

1000 x 2 = 100 x v2

V2 = 2000/ 100

V2 =20

Square root both sides

V = square root of 20

V = 4.48m/s

I hope this was helpful, Please mark as brainliest

4 0
3 years ago
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