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3 years ago

Which pair of scientists should Elizabeth write instead of X

Physics

2 answers:

ASHA 777 [7]3 years ago

5 0

Answer:

O Hooke and Leeuwenhoek

Explanation:

O Hooke and Leeuwenhoek discovered the existence of micro organisms between 1665 and 1683

m_a_m_a [10]3 years ago

5 0

Answer:

O Hooke and Leeuwenhoek

Explanation:

The scientists, O Hooke and Leeuwenhoek were prominent scientists. In fact, they are credited with being the pioneers of science especially the field of microorganisms. To be more specific, the two great scientists discovered what are known as protozoa. This was done specifically by Van Leeuwenhoek who discovered the single celled protozoa ,which were termed animalcules. In addition, the most prominent feature of the research and discovery was Leeuwenhoek's use of a self-designed microscope.

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What is the mass in kg of a leopard in a tree if the tree branch is 36 m up and the leopard's gravitational potential energy is

ElenaW [278]

Answer:

83.3kg

Explanation:

GPE = m × g × h

GPE = mass of leopard × 10 × 36m

29988J = 360 × mass

mass = 83.3kg

5 0

3 years ago

An apple falls out of a tree from a height of 2.3m. what is the impact speed of the apple

Anuta_ua [19.1K]

Answer:6.71 m/s

Explanation:

Given

Apple fall from a height of $h=2.3 m$

We need to find the impact speed of apple which can be given by using

$v^2-u^2=2gh$

where v=final velocity

u=initial velocity

h=Displacement

Assuming initial velocity to be zero

substituting the value we get

$v^2-0=2\times 9.8\times 2.3$

$v=\sqrt{2\times 9.8\times 2.3}$

$v=6.71\ m/s$

5 0

3 years ago

According to relativity theory, if a space trip finds a son or daughter biologically older than his or her parents, then the spa

Valentin [98]

Answer:

B. parents

Explanation:

one of the conclusions from Einsteins relativity theory for his equation E= $mC^{2}$ (where E is energy, m is mass and C is the speed of light),

is that time moves relative to the observer. Time moves more slowly when the observer is in motion (time dilation), therefore an individual in motion ages more slowly than someone at rest. This in fact happened when astronaut Scot Kelly spent nearly a year on board the international space station and on his return, his twin brother had aged slightly faster than him. In conclusion, if a space trip finds a son or daughter is biologically older than his or her parents, the space trip was taken by the parents.

5 0

3 years ago

Determine the magnitude of the current flowing through a 4.7 kilo ohms resistor if the voltage across it is (a) 1mV (b) 10 V (c)

mariarad [96]

Answer:

213 nA

2.13 mA

851e^-t μA

Explanation:

We have a pretty straightforward question here.

Ohms Law states that the current in an electric circuit is directly proportional to the voltage and inversely proportional to the resistance in the circuit. It is mathematically written as

V = IR, since we need I, we can write that

I = V/R

a) at V = 1 mV

I = (1 * 10^-3) / 4.7 * 10^3

I = 2.13 * 10^-7 A or 213 nA

b) at V = 10 V

I = 10 / 4.7 * 10^3

I = 0.00213 A or 2.13 mA

c) at V = 4e^-t

I = 4e^-t / 4.7 * 10^3

I = 0.000851e^-t A or 851e^-t μA

5 0

3 years ago

Ian’s school is exactly 6 blocks north of his house. What is his average velocity on a walk from home to school that takes him 1

choli [55]

Answer:

.5 units north

or

55 ft/minutes(squared) north

Explanation:

.5 is what your info gives me but if i take that the average distance a block is it is 660ft than the answer is 55.

4 0

3 years ago