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Leno4ka [110]
2 years ago
13

A professor determined the relationship between the time spent studying (in hours) and performance on an exam.

Physics
1 answer:
lubasha [3.4K]2 years ago
3 0
Lets write again formula for determening Ann's performance.

P = 70.443 + 4,885*t

where t is in hours. This is equation with P(t) which means that P only depends on variable t. If we express t=2.6 in formula we will find her expected performance.

P = 83.144

Now, since it says that she scored 16 points less than expected we need to find value of P-16

P - 16 = 67.144

After round we get that the answer is 67
You might be interested in
Two small diameter, 10gm dielectric balls can slide freely on a vertical channel each carry a negative charge of 1microcoulomb.
dimulka [17.4K]

Answer:

The distance of separation is d = 0.092 \ m

Explanation:

The mass of the each ball is  m= 10 g  =  0.01 \ kg

 The negative charge on each ball is q_1 =q_2=q =  1 \mu C  =  1 *10^{-6} \ C

Now we are told that the lower ball is  restrained from moving this implies that the net force acting on it is  zero

Hence the gravitational force acting on the lower ball is equivalent to the electrostatic force i.e

          F =  \frac{kq_1 * q_2}{d}

=>       m* g  =  \frac{kq_1 * q_2}{d}

here k the the coulomb's  constant with a value  k = 9*10^{9} \ kg\cdot m^3\cdot s^{-4}\cdot A^2.

So  

      0.01 * 9.8  =  \frac{ 9*10^9 *[1*10^{-6} * 1*10^{-6}]}{d}

            d = 0.092 \ m

5 0
2 years ago
Which is found farthest from the center of an atom?
xxTIMURxx [149]
Electron

Hope this helps
5 0
1 year ago
The average kinetic energy of the molecules of an ideal gas at 10∘C has the value K10. At what temperature T1 (in degrees Celsiu
Westkost [7]

Answer:

A) T1 = 566 k = 293°C

B) T2 = 1132 k = 859°C

Explanation:

A)

The average kinetic energy of the molecules of an ideal gas is givwn by the formula:

K.E = (3/2)KT

where,

K.E = Average Kinetic Energy

K = Boltzman Constant

T = Absolute Temperature

At 10°C:

K.E = K10

T = 10°C + 273 = 283 K

Therefore,

K10 = (3/2)(K)(283)

FOR TWICE VALUE OF K10:

T = T1

Therefore,

2 K10 = (3/2)(K)(T1)

using the value of K10:

2(3/2)(K)(283) = (3/2)(K)(T1)

<u>T1 = 566 k = 293°C</u>

<u></u>

B)

The average kinetic energy of the molecules of an ideal gas is given by the formula:

K.E = (3/2)KT

but K.E is also given by:

K.E = (1/2)(m)(vrms)²

Therefore,

(3/2)KT = (1/2)(m)(vrms)²

vrms = √(3KT/m)

where,

vrms = Root Mean Square Velocity of Molecule

K = Boltzman Constant

T = Absolute Temperature

m = mass

At

T = 10°C + 273 = 283 K

vrms = √[3K(283)/m]

FOR TWICE VALUE OF vrms:

T = T2

Therefore,

2 vrms = √(3KT2/m)

using the value of vrms:

2√[3K(283)/m] = √(3KT2/m)

2√283 = √T2

Squaring on both sides:

(4)(283) = T2

<u>T2 = 1132 k = 859°C</u>

8 0
1 year ago
Both Sony's PlayStation Network and FedEx's systems were developed and are continuously updated to help the companies ________.
Furkat [3]

Answer:

The correct answer is gain a competitive advantage over their competitors.

Explanation:

A company has a competitive advantage when it has a unique and sustainable advantage over its competitors, and this advantage allows it to obtain better results and, therefore, to have a superior competitive position in the market.

There are many sources to generate this type of advantages, such as the location of our company, quality, innovations in the products we manufacture, the service we offer or lower production costs among others.

There are many features on which to build competitive advantages, but all of them can be classified into two main groups:

- Leadership in costs: The objective is to follow a strategy that allows you to reduce costs without reducing the quality of the product offered. In this case, the company achieves lower production costs than its competitors, in order to offer the lowest market price. There are always and there will be customers, whose main purchase decision variable is the most economical price, ignoring other attributes such as quality or service.

- Differentiation: Having features that competing products do not have allows you to raise the sale price, obviously as long as they are appreciated and valued by customers. It's no use adding unique features to our products, if there are no customers willing to pay for them.

4 0
1 year ago
a catcher picks up a baseball from the ground, if the unbalanced force on the ball is 7.25 x 10^-2 N and 4.35 x 10^-2 J of work
omeli [17]
<span>The work is being done against gravity, and equals (Force * vertical distance).
A Joule of work is equivalent to 1 Newton-metre

So vertical distance d = work done / Force
d = 4.35*10^-2J / 7.25*10^-2 N = 0.6 m = 60cm = 600mm </span>
6 0
2 years ago
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