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riadik2000 [5.3K]
3 years ago
6

It is always a good idea to get some sense of the "size" of units. For example, the mass of an apple is about 100 g , whereas a

bicycle is about a hundred times more massive at around 10 kg . Estimate the mass of the objects.

Physics
1 answer:
marta [7]3 years ago
4 0

Answer and Explanation:

The estimation of the mass of the objects is as follows

Given that

The mass of an apple is about 100 g

Just like that, we do some estimation of different objects

A dime is around 1 g

A smartphone is about 100 g

An adult male is approx 100 kg

A college physics textbook is around 1 kg

A ripe banana is around 100 g

A small car is around 1,000 kg

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If a 20kg object is moved across the floor and the coefficient of friction is 0.255. What is the frictional force?
Sladkaya [172]

Ff=μN=μmg=0.255*20=5.1 N

5 0
3 years ago
True or false The momentum of a 100kg object traveling at 3 m/s is 300 N
melomori [17]

Answer:

True

Explanation:

Momentum of an object can be defined as the product of its mass and velocity at which it is travelling. With that in mind, momentum = 3*100=300(kg⋅m/s).

One thing to note is the units mentioned. The SI unit of momentum is kg * m/s as it is the product of mass(kilograms) and velocity(meter per second) and not Newton.

5 0
3 years ago
a 4kg metal block absorbs 5000j of energy and increases to a temperature of 22°c. the metal has a specific heat capacity of 250j
e-lub [12.9K]

Answer:

17 °C

Explanation:

From specific Heat capacity.

Q = cm(t₂-t₁)................. Equation 1

Where Q = Heat absorb by the metal block, c = specific heat capacity of the metal block, m = mass of the metal block, t₂ = final temperature, t₁ = Initial temperature.

make t₁ the subject of the equation

t₁ = t₂-(Q/cm)............... Equation 2

Given: t₂ = 22 °C, Q = 5000 J, m = 4 kg, c = 250 J/kg.°c

Substitute into equation 2

t₁ = 22-[5000/(4×250)

t₁ = 22-(5000/1000)

t₁ = 22-5

t₁ = 17 °C

6 0
2 years ago
What occurs during an exothermic change
Likurg_2 [28]
In an exothermic reaction, there is a transfer of energy to the surroundings in the form of heat energy. The surroundings of the reaction will experience an increase in temperature. Many types of chemical reactions are exothermic, including combustion reactions, respiration & neutralization reactions of bases & acids.
6 0
3 years ago
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ASK YOUR TEACHER A baseball with a mass of 146 g is thrown horizontally with a speed of 40.6 m/s (91 mi/h) at a bat. The ball is
RideAnS [48]

Answer:

Explanation:

mass of the ball = 146 g = 146 / 1000 = 0.146 kg

initial speed of the ball = 40.6 m/s

final speed of the ball = - 45.1 m/s

time of impact = 1.05 ms = 1.05 / 1000 = 0.00105 s

impulse, Ft = change in momentum = mv - mu = m (v-u)

F = m (v - u) / t = 0.146 kg ( -45.1 -40.6) / 0.00105 s = -11916.4 N

4 0
3 years ago
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