3 years ago

HURRY IM ON A TEST

Physics

1 answer:

kenny6666 [7]3 years ago

4 0

Answer: A person leaning on a wall

Explanation:

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Please help with this question ASAP!!!

Paladinen [302]

The answer is the second choice

7 0

4 years ago

a football is kicked at an 50 degree angle to the horizontal , travels a horizontal distance of 20m before hitting the ground. w

zimovet [89]

So initial velocity of football is 14.25 m/s

8 0

4 years ago

A toy car is placed 29.0cm from a convex mirror. The image of the car is upright and one-sixth as large as the actual car. Calcu

borishaifa [10]

Answer:

The power of the mirror is -17.24 diopter.

Explanation:

Magnification of an image,m = $\frac{1}{6}$

Distance of the object from the mirror = u = 29.0 cm

Distance of an image from the mirror = v

Magnification = $m=\frac{-v}{u}$

$\frac{1}{6}=\frac{-v}{u}$

$v=\frac{-u}{6}$

$\frac{1}{f}=\frac{1}{u}+\frac{1}{v}$

$\frac{1}{f}=\frac{1}{u}+\frac{-6}{u}$

$f=\frac{-u}{5}=\frac{-29.0 cm}{5}=-5.8 cm$

Focal length of mirror = -5.8 cm =-0.058 m

Power of the lens = P

$P =\frac{1}{f}$

$P=\frac{1}{-0.058 m}=-17.24 D$

8 0

3 years ago

Which answer below correctly identifies the type of change and the explanation for the heating of copper sulfate pentahydrate?

dolphi86 [110]

Answer:

chemical change because gas formation was observed along with a color change, which indicated that the copper sulfate pentahydrate was transformed into a different substance

Explanation:

i took a test

6 0

4 years ago

Atoms in a solid are in continuous vibrational motion due to thermal energy. At room temperature, the amplitude of these atomic

Bingel [31]

Answer:

10 m/s

Explanation:

Given:

Amplitude of atomic vibrations (λ) = 10⁻⁹ cm = 10⁻⁹ × 10⁻² m = 10⁻¹¹ m [1 cm = 10⁻² m]

Frequency of the vibrations (f) = 10¹² Hz

In order to find the atom's maximum speed, we need to make use of the formula that relates speed, frequency and wavelength of the vibration.

Therefore, the formula for maximum speed is given as:

$v=f\lambda$

Now, plug in the values given and solve for speed 'v'. This gives,

$v=(10^{12}\ Hz)(10^{-11}\ m)\\\\v=10^{12-11}\ m/s\\v=10\ m/s$

Therefore, the atom's maximum speed due to thermal energy provided is 10 m/s.

6 0

4 years ago