Ask question

Ask question

All categories

3 years ago

9

How much force is needed to accelerate a 66 kg skier at 2 m/s2

1 answer:

Ksju [112]3 years ago

5 0

Answer:

132 N

Explanation:

F = ma

F = (66 kg) (2 m/s²)

F = 132 N

You might be interested in

you drop a 2 kg book to a friend who stand on the ground at distance D=10.0 m below, if your friends out streched hand at distan

MariettaO [177]

Work is defined as force*displacement so total d=8.5m and force will be 2kg*g which is roughly 20N of force so W = 20N*8.5m=170J

For part b the gravitational energy is m*g*h so gravitational energy = 200J since 2kg*10 m/s^2 *10m so the change since the work is 170 j means total change is 170J and 30J is left

8 0

4 years ago

Read 2 more answers

What is the relationship between chromosomes and a body's appearance? (A) Chromosomes make it possible for all bodies to exactly

Katen [24]

Answer: The correct option is B.

Chromosomes contain genes that tell the body how to grow and work.

Explanation:

This is because chromosomes contain alot of human genes which are found in the nucleus and every humans have 23 pairs of chromosomes. The sets of genes determines some of the body features, characteristics or traits. The genes in the body form the genotype and the genotype is expressed physically which is now the phenotype i.e traits expressed physically in the body which is an indication of body appearance.

7 0

3 years ago

For atomic hydrogen, the Paschen series of lines occurs when nf = 3, whereas the Brackett series occurs when nf = 4 in the equat

zvonat [6]

Answer:

$(\lambda_{max} )_{brackett} < (\lambda_{min} )_{paschen}$

So the two wavelength range will over lap

Explanation:

The Rydberg equation is given by

$\frac{1}{\lambda} =\frac{2\pi mk^2e^4}{h^3c} t (\frac{1}{n^2_f}-\frac{1}{n^2_i} )$

m is the mass of electron

k = 1/4π∈₀

∈₀ = is the permitivity of free space

e is the charge of electron

h is the plank constant

c is the speed of light in vaccum

z is the atomic number = 1

$\frac{1}{\lambda} =R (\frac{1}{n^2_f}-\frac{1}{n^2_i} )$

where R is the Rydberg constant = 1.097373 × 10⁷m⁻¹

For Paschen series of H spectrum

$n_f = 3$

$n_i = 5,6,7 ...$

in Paschen series of H spectrum

The maximum wavelength occur for $n_i = 4$

$\frac{1}{\lambda_m_a_x } =(1.097373 \times 10^7)(\frac{1}{9} - \frac{1}{16} )\\\\\lambda_m_a_x=1874.6nm$

The minimum wavelength occur for $n_i$ = ∞

$\frac{1}{\lambda_m_i_n } =(1.097373 \times 10^7)(\frac{1}{9} - \frac{1}{_o_o} )\\\\\lambda_m_a_x=820.14nm$

The brackett series of H spectrum

The maximum wavelength occur for $n_i = 4$

$\frac{1}{\lambda_m_a_x } =(1.097373 \times 10^7)(\frac{1}{16} - \frac{1}{25} )\\\\\lambda_m_a_x=4050.05nm$

The minimum wavelength occur for $n_i$ = ∞

$\frac{1}{\lambda_m_i_n } =(1.097373 \times 10^7)(\frac{1}{16} - \frac{1}{_o_o} )\\\\\lambda_m_a_x=1458.03nm$

$(\lambda_{max} )_{brackett} < (\lambda_{min} )_{paschen}$

So the two wavelength range will over lap

8 0

4 years ago

A roller coaster moving down a hill is an example of what kind of energy

GalinKa [24]

That would be kinetic energy

5 0

3 years ago

Read 2 more answers

Calculate the rate of energy transfer by a 5 ohms resistor when there is a current of 0.2 A in it.

vredina [299]

Answer: The rate of energy transfer by a 5 ohms resistor when there is a current of 0.2 A in it.= 1.25 watt.

Explanation:

The rate of energy transfer from one point to another is known as power.
Its SI. unit is <em>Watt.</em>

Formula to compute power:

Power = $I^2 R$ , I = cureent, R = resistance.

Given R = 5 ohm , Current = 0.5 A.

Then, power = $(0.5)^2\times 5=0.25\times5=1.25\ watt$

Hence, the rate of energy transfer by a 5 ohms resistor when there is a current of 0.2 A in it.= 1.25 watt.

5 0

3 years ago