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2 years ago

Which temperature is warmer than the freezing point of water

Physics

1 answer:

worty [1.4K]2 years ago

7 0

Answer:

1°C

Explanation:

Water freezes at 0°C, 32°F, and 273°K.

The only temperature warmer than the freezing point is 1°C.

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What minerals can Fluorite scratch?

timurjin [86]

Fluorite has a hardness of 4 out of 10 and can scratch gypsum, talc and anything less than 4. Fluorite has a hardness of 4 out of 10 and can scratch gypsum, talc and anything less than 4.

6 0

2 years ago

A student pushes a 21-kg box initially at rest, horizontally along a frictionless surface for 10.0 m and then releases the box t

Marrrta [24]

Answer:v=3.08 m/s

Explanation:

Given

mass of student $m=21 kg$

distance moved $d=10 m$

Force applied $F=10 N$

acceleration of system during application of force is a

$a=\frac{F}{m}=\frac{10}{21}=0.476 m/s^2$

using $v^2-u^2=2 as$

where v=final velocity

u=initial velocity

a=acceleration

s=displacement

$v^2-0=2\times 0.476\times 10$

$v=\sqrt{9.52}$

$v=3.08 m/s$

6 0

3 years ago

How high a hill can a car coast up (engine disengaged) if work done by friction is negligible and

aev [14]

Answer:

h= 46.66 m

Explanation:

Given that

Initial speed of the car ,u = 110 km/h

We know that

1 km/h= 0.277 m/s

u= 30.55 m/s

lets height gain by car is h.

The final speed of the car will be zero at height h.

v²=u²- 2 g h

v= 0 m/s

0²=30.55²- 2 x 10 x h ( g = 10 m/s²)

h= 46.66 m

4 0

3 years ago

1. Plot the following graphs:

VLD [36.1K]

Answer:

(a) The distance-time graph for an object with uniform speed is giving by a straight line sloped graph with a constant positive or negative gradient as shown in the attached diagram

(b) The distance-time graph for an object with non-uniform speed is giving by a curved line sloped graph with varying gradient as shown in the attached diagram

(c) The velocity-time graph for a car with uniform motion is giving by a horizontal line graph at the speed of constant motion with a zero gradient as shown in the attached diagram

(d) The velocity-time graph for a car moving with uniform acceleration is giving by a straight line sloped graph with a constant positive or negative gradient as shown in the attached diagram

(e) The velocity-time graph for a car moving with non-uniform acceleration is giving by a curved line sloped graph with varying gradient as shown in the attached diagram

(f) According to Newton's first law of motion, an object at rest will remain at rest with no motion unless acted by a force, an therefore, will have no motion with time

Explanation:

8 0

3 years ago

Does the sun fuse hydrogen into helium or vice versa?

NikAS [45]

Hydrogen has the smaller, lighter, simpler nucleus.
Helium has the larger, heavier, more complex nucleus.
Hydrogen nuclei are fused to form helium nuclei.
When that happens, energy is released.

6 0

2 years ago