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3 years ago

What substances help muscles move

1 answer:

8 0

Together, our bones, muscles, and joints along with tendons, ligaments, and cartilage form our musculoskeletal system and enable us to do everyday physical activities

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Jan needs 10 meters of yarn. She has 746 centimeters. How many more cm does she need

MAVERICK [17]

Answer:

254

Explanation:

100 centimeters is equal to 1 meter.

So I multiplied 10 (for the meters if yarn) times 100(for the centimeters) and i got 1000

I then subtracted 746 from the 1000 and was left with 254

Hope that helped , if so give brainliest please

6 0

3 years ago

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A spring with a spring constant of 120 J/m2 is fixed to a wall, free to oscillate. On the other end, a ball with a mass of 1500

Neporo4naja [7]

Answer:

A. 4.47 m/s

Explanation:

As the ball oscillates, it mechanical energy, aka the total kinetic and elastics energy stays the same. For the ball to be at maximum speed, its elastic energy i 0 and vice versa. When the ball is at rest, its kinetic energy is 0 and its elastic energy is at maximum at 50 cm, or 0.5 m

1500 g = 1.5 kg

$E_e = E_k$

$kx^2/2 = mv^2/2$

$120*0.5^2/2 = 1.5*v^2/2$

$15 = 0.75v^2$

$v^2 = 15 / 0.75 = 20$

$v = \sqrt{20} = 4.47 m/s$

5 0

4 years ago

The price elasticity of demand for tickets to local baseball games is estimated to be equal to 0.89. In order to boost ticket re

katen-ka-za [31]

Answer:

a. increasing the price of game tickets because demand is inelastic.

Explanation:

The price elasticity of demand is used in economics to show the elasticity of the quantity demand.Elasticity measure the change in the variable when another variable changes.Generally price elasticities are negative but we avoid the sign.Those good does not follows law of demand have positive sign.

So the answer of the given question is a.

a. increasing the price of game tickets because demand is inelastic.

5 0

3 years ago

An electron is in motion at 4.0 × 106 m/s horizontally when it enters a region of space between two parallel plates, as shown, s

max2010maxim [7]

Answer:

xmax = 9.5cm

Explanation:

In this case, the trajectory described by the electron, when it enters in the region between the parallel plates, is a semi parabolic trajectory.

In order to find the horizontal distance traveled by the electron you first calculate the vertical acceleration of the electron.

You use the Newton second law and the electric force on the electron:

$F_e=qE=ma$ (1)

q: charge of the electron = 1.6*10^-19 C

m: mass of the electron = 9.1*10-31 kg

E: magnitude of the electric field = 4.0*10^2N/C

You solve the equation (1) for a:

$a=\frac{qE}{m}=\frac{(1.6*10^{-19}C)(4.0*10^2N/C)}{9.1*10^{-31}kg}=7.03*10^{13}\frac{m}{s^2}$

Next, you use the following formula for the maximum horizontal distance reached by an object, with semi parabolic motion at a height of d:

$x_{max}=v_o\sqrt{\frac{2d}{a}}$ (2)

Here, the height d is the distance between the plates d = 2.0cm = 0.02m

vo: initial velocity of the electron = 4.0*10^6m/s

You replace the values of the parameters in the equation (2):

$x_{max}=(4.0*10^6m/s)\sqrt{\frac{2(0.02m)}{7.03*10^{13}m/s^2}}\\\\x_{max}=0.095m=9.5cm$

The horizontal distance traveled by the electron is 9.5cm

4 0

4 years ago

If the magnets are brought close together, they will

murzikaleks [220]

It depends on which side. Opposites attract, so north and south would attract to each other and collide, while north and north or south and south would go away from eachother.

7 0

4 years ago

Read 2 more answers