Answer:
1.22gcm³
Explanation:
D = mass/ volume
Mass=1.840kg = 1,840g
1000g = 1kg
1.840kg= x(g)
X(g) = 1.840/1000
= 1840g
Volume = 0.0015m³= 1,500cm³
1m³= 1000,000cm³.
0.0015m³= x(cm³)
X(cm³) = 1000,000×0.0015
X(cm³)= 1500.
Since density is mass/volume, now impute your data's
D=m/v
D=1840/1500
1.22g/cm³
The right answer is b) copper
Answer : The work function of this metal is, 
Explanation : Given,
Wavelength of light = 
Formula used :
where,
E = work function of metal
h = Planck's constant = 
= threshold frequency
= wavelength of light
c = speed of light = 
Now put all the given values in this formula, we get the value of work function of this metal.
Therefore, the work function of this metal is,
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Answer:
The velocity of the car after 3 seconds is 5.5 m/s
Explanation:
Mathematically, we can get the acceleration of the car first;
F = m•a
where m is the mass, F is the applied force and a is the acceleration
from the question;
F = 1500 N , m = 4500 kg and a = ?
By rewriting the formula;
a = F/m
a = 1500/4500 = 1/3 m/s^2
Now to get the velocity of the car after 3 seconds;
Mathematically;
V = U + at
where V is the final
velocity, U is the initial velocity,
From the question, we are trying to get V;
where U = 4.5 m/s
a = 1/3 m/s^2 and t = 3 seconds
Thus;
V = 4.5 + (1/3)(3)
V = 4.5 + 1
V = 5.5 m/s
