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3 years ago

15

What is sap?

2 answers:

Olegator [25]3 years ago

6 0

Sap is syrup looking stuff found in pine trees

Paladinen [302]3 years ago

4 0

Its A Sap is basically a fluid which is transported in to the xylem tubes.

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Galileo discovered that which planet undergoes phases as viewed from earth?

balu736 [363]

<h2>Answer: Venus</h2>

Galileo was the first to use the telescope to observe the heavens, mainly observing the Moon, the Sun with its sunspots, Jupiter with its moons and Venus (in the early 1600s).

In the case of Venus, he observed that it presented phases (such as those of the moon) together with a variation in size; observations that are only compatible with the fact that Venus rotates around the Sun and not around Earth.

This is because Venus presented its smaller size when it is in full phase and the largest size when it is in the new one, when it is between the Sun and the Earth.

These images along with other discoveries were presented to the Catholic Church (which supported the <u>geocentric theory</u> for that time) as a proof that completely refutes Ptolemy's geocentric system and affirms <u>Copernicus' heliocentric theory.</u>

3 0

3 years ago

(II) A 0.72-m-diameter solid sphere can be rotated about an axis through its center by a torque of 10.8 m • N which accelerates

kozerog [31]

Answer:

$m = 23.3 kg$

Explanation:

As we know that it will have constant torque on it

so the acceleration of the ball will be constant so here we can say that we can use kinematics equation

$\theta = \omega_i t + \frac{1}{2}\alpha t^2$

$160(2\pi) = 0 + \frac{1}{2}\alpha (15^2)$

$320 \pi = 112.5 \alpha$

so we have

$\alpha = \frac{320\pi}{112.5}$

$\alpha = 8.94 rad/s^2$

now we know that

$\tau = I \alpha$

$10.8 = I(8.94)$

$I = 1.21 kg m^2$

so we know that

$I = \frac{2}{5}mR^2$

here we know that

diameter = 0.72 m

so radius (R) = 0.36 m

$\frac{2}{5}m(0.36^2) = 1.21$

$m = 23.3 kg$

8 0

3 years ago

What is the change in internal energy (in J) of a system that releases 954 J of thermal energy to its surroundings and has 166 c

Harman [31]

Answer:

259.456 J

Explanation:

Given that,

Work done on the system = 166 cal

The systam releases 954 J of thermal energy to its surroundings

We need to find the change in internal energy. It can be given by using the first law of thermodynamics as follows :

$\Delta U=Q-W$

W = 166 cal = 694.544 (1cal = 4.184 J)

$\Delta U=954-694.544\\\\=259.456\ J$

So, the change in internal energy of the system is 259.456 J.

4 0

3 years ago

A metal ball sits motionless on a flat surface. Which of these would make the ball move?

Digiron [165]

Answer:

D

Explanation:

Unbalanced forces move stuff. Gravity would only increase/decrease movement if the object was already in motion.

6 0

3 years ago

Read 2 more answers

When the palmaris longus muscle in the forearm is flexed, the wrist moves back and forth. If the muscle generates a force of 53.

AleksAgata [21]

Answer:

1.20Nm

Explanation:

Given data

Force= 53.5N

Perpendicular distance= 2.25cm= 2.25/100= 0.0225m

The expression for the torque is given as

Torque= Force* Perpendicular distance

Torque= 53.5*0.0225

Torque= 1.20Nm

Hence the toque produced is 1.20Nm

7 0

3 years ago