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Varvara68 [4.7K]
3 years ago
11

Can you find the density of water? How would you do it?

Physics
1 answer:
Ilya [14]3 years ago
3 0
The Density of Water is 1.
You find the volume of a sample of water, then find the mass. Divide the mass by the volume to get the density. The volume and mass should be the same, which then means that the density would be 1.
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A school bus moves past a parked car at a speed of 30 km/hr. Which of the following BEST describes the observation made by a pas
ddd [48]

Answer:

C.The car appears to be moving 30 km/hr in the opposite direction of the bus.

Explanation:

There are two reference systems involved in this situation:

- Reference system S: this is the reference system where velocities are measured with respect to the ground. In this reference system, the car is parked, so its velocity is v=0

- Reference system S': this is the reference system moving with the bus. This reference system is moving with a velocity of v_0 = +30 km/h with respect to the reference system S

Calling v' the velocity of the car in the reference system S', we have:

v=v_0 +v'

From which

v'=v-v_0 = 0-(+30 km/h)=-30 km/h

and the negative sign means that a passanger in the bus observes the car moving in the opposite direction.

8 0
3 years ago
What is gravity? I need help.
sweet [91]
<span>the force that attracts a body toward the center of the earth, or toward any other physical body having mass. For most purposes Newton's laws of gravity apply, with minor modifications to take the general theory of relativity into account.</span>
8 0
3 years ago
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What is the magnitude of the gravitational force the apple exerts on earth?
blagie [28]
It's downward vector from the centre of apple in the direction to the centre of the Earth.
4 0
3 years ago
A negative ion is (larger/smaller) than its parent atom
Lerok [7]
Its larger and if u where wondering to positive ions are smaller
6 0
3 years ago
A steady beam of alpha particles (q = + 2e, mass m = 6.68 × 10-27 kg) traveling with constant kinetic energy 22 MeV carries a cu
cluponka [151]

Answer:

Explanation:

q = 2e = 3.2 x 10^-19 C

mass, m = 6.68 x 10^-27 kg

Kinetic energy, K = 22 MeV

Current, i = 0.27 micro Ampere = 0.27 x 10^-6 A

(a) time, t = 2.8 s

Let N be the alpha particles strike the surface.

N x 2e = q

N x 3.2 x 10^-19 = i t

N x 3.2 x 10^-19 = 0.27 x 10^-6 x 2.8

N = 2.36 x 10^12

(b) Length, L = 16 cm = 0.16 m

Let N be the alpha particles

K = 0.5 x mv²

22 x 1.6 x 10^-13 = 0.5 x 6.68 x 10^-27 x v²

v² = 1.054 x 10^15

v = 3.25 x 10^7 m/s

So, N x 2e = i x t

N x 2e = i x L / v

N x 3.2 x 10^-19 = 2.7 x 10^-7 x 0.16 / (3.25 x 10^7)

N = 4153.85

(c) Us ethe conservation of energy

Kinetic energy = Potential energy

K = q x V

22 x 1.6 x 10^-13 = 2 x 1.5 x 10^-19 x V

V = 1.17 x 10^7 V

5 0
3 years ago
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