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4 years ago

Which steps are important when designing and conducting a scientific experiment

1 answer:

8 0

Having your space clean. have on close toed shoes. have your hair pulled back into a ponytail. keep ur work space clean. wear gloves and goggles. do not have on droopy clothes. follow the steps on the board and double check them.

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A 1000 kg elevator accelerates upward at 1.0 m/s2 for 10 m, starting from rest. a. How much work does gravity do on the elevator

cricket20 [7]

Answer:

a)= 98kJ

b)=108kJ

c) = 10kJ

Explanation:

a. The work that is done by gravity on the elevator is:

Work = force * distance

= mass * gravity * distance

= 1000 * 9.81 * 10

= 98,000 J

= 98kJ

b)The net force equation in the cable

T - mg = ma

T = m(g+a)

T = 1000(9.8 + 10)

T = 10800N

The work done by the cable is

W = T × d

= 10800N × 10

= 108000

=108kJ

c) PE at 10m = 1000 * 9.81 * 10 = 98,100 J

Work done by cable = PE +KE

108,100 J = KE + 98,100 J

KE = 10,000 J

= 10kJ

7 0

4 years ago

Read 2 more answers

What other forces affect the soccer ball after the student's foot stops touching it?

hodyreva [135]

Gravity, acceleration, velocity

8 0

3 years ago

Read 2 more answers

In a Hydrogen atom an electron rotates around a stationary proton in a circular orbit with an approximate radius of r =0.053nm.

VLD [36.1K]

Answer:

(a) 8.2 x 10^-8 N

(b) 3.6 x 10^-47 N , 2.27 x 10^39

Explanation:

charge of proton, q1 = 1.6 x 10^-19 C

charge of electron, q2 = - 1.6 x 10^-19 C

radius of orbit, r = 0.053 nm = 0.053 x 10^-9 m

mass of electron, me = 9.1 x 10^-31 kg

mass of proton, mp = 1.67 x 10^-27 kg

Gravitational constant, G = 6.67 x 10^-11 Nm^2/kg^2

(a) The electrostatic force between two charges is given by

$F_{e}=\frac{Kq_{1}q_{2}}{r^2}$

Where, K is the coulombic constant = 9 x 10^9 Nm^2/C^2

By substituting the values

$F_{e}=\frac{9\times 10^{9}\times 1.6\times 10^{-19}\1.6\times 10^{-19}}{\left ( 0.053 \times 10^{-9} \right )^2}$

Fe = 8.2 x 10^-8 N

(b) The gravitational force between the electron and proton is given by

$F_{g}=\frac{Gm_{e}m_{p}}{r^{2}}$

$F_{g}=\frac{6.67\times 10^{-11}\times 9.1\times 10^{-31}\1.67\times 10^{-27}}{\left ( 0.053 \times 10^{-9} \right )^2}$

Fg = 3.6 x 10^-47 N

$\frac{F_{e}}{F_{g}}=\frac{8.2\times10^{-8}}{3.6\times 10^{-47}}$

$\frac{F_{e}}{F_{g}}=2.27\times 10^{39}$

5 0

3 years ago

In a physics motion study, students established a frame of reference for measurements. Which of the following is their most like

Irina-Kira [14]

I think it might be (D)

3 0

3 years ago

Sonar is a device that uses reflected sound waves to measure underwater depths. If a sonar signal has a wavelength of 5.9 m and

dmitriy555 [2]

The frequency of the signal is = 2.5 Hz

<h3>Calculation of frequency</h3>

The wavelength of the sonar device = 5.9 m

The velocity of the sound = 15 m/s

The frequency = ?

But the formula for the velocity of sound wave = frequency × wavelength

Male frequency the subject of formula,

f = v/ wavelength

f = 15/5.9

f = 2.5Hz

Therefore, the frequency of the signal is = 2.5Hz

Learn more about sound waves here:

brainly.com/question/1199084

#SPJ1

6 0

2 years ago