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Contact [7]
3 years ago
15

How much time does it take for a runner moving at a speed of 8.0 meters per second to come to a stop if her

Physics
1 answer:
creativ13 [48]3 years ago
8 0

Answer:

a. 4.0 s

Explanation:

Given:

v₀ = 8.0 m/s

v = 0 m/s

a = -2.0 m/s²

Find: t

v = v₀ + at

(0 m/s) = (8.0 m/s) + (-2.0 m/s²) t

t = 4 s

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If the mass of both weights is 225 gm, the first mass is located 20∘ north of east, the second mass is located 20∘ south of east
Montano1993 [528]

Answer:

The voltage is 2.114 V.

Explanation:

Given that,

Mass of both weights = 225 gm

Transducer sensitivity = 0.5 V/N

The first mass is located 20∘ north of east, the second mass is located 20∘ south of east,

We need to calculate the net equivalent force

Using formula of force

F_{3}=m_{1}g\cos\theta+m_{2}g\cos\theta

F_{3}=2mg\cos\theta

Put the value into the formula

F_{3}=2\times0.225\times10\cos20^{\circ}

F_{3}=4.228\ N

We need to calculate the voltage

Using formula of voltage

Voltage =sensitivity\times F_{3}

Put the value into the formula

Voltage=0.5\times4.228

Voltage =2.114\ V

Hence, The voltage is 2.114 V.

7 0
4 years ago
When resistance is decreased in a circuit, current will _________.
Mars2501 [29]
The answer is A. Increase

The formula is <span>Voltage = Resistance X Current

Lets say the voltage is 10 and the resistence is 5

10 = 5 x current
Current = 2

Now, lets decrease the resistence from 5 to 2

10 = 2 x Current
Current = 5

The current increases
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8 0
3 years ago
Is hot asphalt that is poured into the ground and cools a physical or chemical change?
Gala2k [10]
Physical change
Because it's changed by heat
5 0
4 years ago
Read 2 more answers
a uniform electric field E=15 N/C points downwards. A particle with charge q=-0.15 C is placed in the electric field. What is th
Alex17521 [72]

Answer:

2.25 N upwards

Explanation:

Answer:

800 N/C to the right

Explanation:

The equation that relates force on a charge, electric field and charge is

F=qE

where

F is the force acting on the charge

q is the charge

E is the electric field

In this problem, we have

E=15 N/C is the electric field

q=-0.15 C is the charge

Substituting into the formula, we find the force

F=(-0.15 C)(15 N/C)=-2.25 N

Concerning the direction:

- The electric field and the force have same directions if the charge is positive

- The electric field and the force have opposite directions if the charge is negative

Here the charge is negative, so the electric field has opposite direction to the force: therefore, it must be upwards.

3 0
3 years ago
Which statement regarding the “Evaporation” lab is most accurate?
Sladkaya [172]
Substances evaporate at different rates
4 0
4 years ago
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