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4 years ago

The total number of protons plus neutrons in an atom of ⁴⁵₂₀Ca is

Physics

1 answer:

umka2103 [35]4 years ago

3 0

Answer:

Explanation:

The number of protons plus neutrons in an atom of 45 and 20ca is 65.

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Two horizontal forces are exerted on a large crate. The first force is 317 N to the right. The second force is 173 N to the left

DENIUS [597]

Answer:

A. Refer to the figure.

B. The net force acting on the crate is

$F_{net} = F_1 - F_2 = 317 - 173 = 144N$

C. We should first find the acceleration of the crate using the following kinematics equation:

$v = v_0 + at\\6.5 = 0 + 5a\\a = 1.3 m/s^2$

Mass of the crate can be found by Newton’s Second Law:

$F = Ma\\M = F/a = 144/1.3 = 110.7 kg$

7 0

4 years ago

The 15 g head of a bobble-head doll oscillates in SHM at a frequency of 4.0 Hz.

Goshia [24]

Answer:

(a) 9.375 N/m

(b) 0.5024 m/s

Explanation:

mass of head, m = 15 g = 0.015 kg

frequency, f = 4 Hz

Time period, T = 1 / f = 0.25 s

Let k is the spring constant.

(a)

The formula for the time period is

$T=2\pi\sqrt{\frac{m}{K}}$

$0.25=2\times 3.14 \sqrt{\frac{0.015}{K}}$

$0.04=\sqrt{\frac{0.015}{K}}$

K = 9.375 N/m

(b)

Amplitude, A = 2 cm

Let ω is the angular velocity.

Maximum velocity, v = A ω = A x 2πf

v = 0.02 x 2 x 3.14 x 4 = 0.5024 m/s

(c)

Let b is the damping constant.

A(t = 4s) = 0.5 cm

Ao = 2 cm

Using the formula of damping

$\frac{A}{A_{0}}=e^{-\frac{bt}{2m}}$

$\frac{0.5}{2}}=e^{-\frac{b\times 4}{2\times 0.015}}$

$0.25=e^{-133.3 b}$

Taking natural log on both the sides

ln (0.25) = - 133.3 b

- 133.3 b = - 1.386

b = 0.01 kg/s

3 0

3 years ago

A car increases its velocity from zero to 68 km/h in 12 s.

Bond [772]

Answer:

1.574 [m/s²].

Explanation:

1) acceleration is: a=(V-V₀)/t, where V - final velocity [68km/h=18.(8)m/s]; V₀ - initial velocity [0]; t - elapsed time [12sec.];

2) according to the formula above:

a=18.(8)/12≈1.574 [m/s²].

6 0

3 years ago

DANIEL HAS A SAMPLE OF PURE COPPER. ITS MASS IS 89.6 GRAMS, AND ITS VOLUME IS 10 CUBIC CENTIMETERS. WHATS THE DENSITY OF THE SAM

Vitek1552 [10]

So the formula for density is mass divided by volume, so it would be

6 0

4 years ago

Read 2 more answers

Calculate the gravitational force of the Earth and Moon. The Earth has a mass of 5.972x 1024 kg and the Moon has a mass of 7.348

Wewaii [24]

The gravitational force is 1.98×10^20 m.

Computation of gravitational force:

The gravitational force F between two masses is given by the formula,

F=Gm1m2/ r^2

where G is the gravitational constant.

Note: It is assumed m1=5.972×10^24 kg, m2=7.348×10^22 kg and r=3.84×10^8 m and G=6.67×10^(-11) N m^2 kg^-2

Then F=(6.67×10^(-11)×5.972×10^(24)×7.348×10^(22))/ (3.84×10^8)

F=1.98×10^(20) N

Check out more about gravitational force here:

brainly.com/question/13054973

#SPJ 4

7 0

2 years ago

Read 2 more answers