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4 years ago

PLEASE HURRY 20 PTS

Physics

1 answer:

Crank4 years ago

5 0

Answer:

A. The electric field points to the left because the force on a negative charge is opposite to the direction of the field.

Explanation:

The electric force exerted on a charge by an electric field is given by:

where

F is the force

q is the charge

E is the electric field

We see that if the charge is negative, q contains a negative sign, so the force F and the electric field E will have opposite signs (which means they have opposite directions). This is due to the fact that the direction of the lines of an electric field shows the direction of the electric force experienced by a positive charge in that electric field: therefore, a negative charge will experience a force into opposite direction.

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Please help me I have to send for my teacher

expeople1 [14]

Answer:

for the fill in the blanks

1- static

2-kinetic

3-coeffiecient

4-opposite to

5-sin theta

6-cos theta

im not sure however what to do with the top part or if its even part of what you need help with

8 0

3 years ago

An amateur player is about to throw a dart with an initial velocity of 15 meters/second onto a dartboard that is at a distance o

inysia [295]

Answer:

vertical distance, s = 0.16 meters

Explanation:

It is given that,

An amateur player is about to throw a dart with an initial velocity of 15 meters/second onto a dartboard.

Dashboard is placed at a distance of 2.7 meters.

Calculating time from velocity and distance i.e. $t=\dfrac{d}{s}=\dfrac{2.7}{15}\ s=0.18\ s$

Using second equation of motion for finding vertical distance :

$s=ut+0.5gt^2$

Here, u = 0 (for vertical velocity )

$s=0.5gt^2$

$s=0.5\times 10\times (0.18)^2$

s = 0.162 meters

or s = 0.16 meters

Hence, the vertical distance by which the player will miss the target if he throws the dart horizontally, in line with the dartboard is 0.16 meters.

3 0

3 years ago

An egg is thrown horizontally off the roof of a school, which is 15.0 m high, with an initial velocity of 6.50 m/s. How long doe

givi [52]

Answer:

1.75 s

11.4 m

Explanation:

In the y direction:

Given:

Δy = -15.0 m

v₀ = 0 m/s

a = -9.8 m/s²

Find: t

Δy = v₀ t + ½ at²

-15.0 m = (0 m/s) t + ½ (-9.8 m/s²) t²

t = 1.75 s

In the x direction:

Given:

t = 1.75 s

v₀ = 6.50 m/s

a = 0 m/s²

Find: Δx

Δx = v₀ t + ½ at²

Δx = (6.50 m/s) (1.75 s) + ½ (0 m/s²) (1.75 s)²

Δx = 11.4 m

8 0

4 years ago

A 600-kg car accelerates from rest to 10 m/s^2. What is the force on the car?

iris [78.8K]

Answer:

60000 newtons

Explanation:

Force=mass × acceleration

60000

3 0

3 years ago

Digital thermometers often make use of thermistors, a type of resistor with resistance that varies with temperature more than st

Nezavi [6.7K]

Answer:

The temperature coefficient of resistivity for a linear thermistor is $1.38\times10^{-3}^{\circ}C^{-1}$

Explanation:

Given that,

Initial temperature = 0.00°C

Resistance = 75.0 Ω

Final temperature = 525°C

Resistance = 275 Ω

We need to calculate the temperature coefficient of resistivity for a linear thermistor

Using formula for a linear thermistor

$R=R_{0}(1+\alpha\Delta T)$

$R=R_{0}+R_{0}\alpha\Delta T$

$\alpha=\dfrac{R-R_{0}}{R_{0}\Delta T}$

Put the value into the formula

$\alpha=\dfrac{275-75}{275\times(525-0)}$

$\alpha=1.38\times10^{-3}^{\circ}C^{-1}$

Hence, The temperature coefficient of resistivity for a linear thermistor is $1.38\times10^{-3}^{\circ}C^{-1}$

4 0

3 years ago

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